National Institute of Standards and Technology

Computational Chemistry Comparison and Benchmark DataBase
Release 22	May 2022
NIST Standard Reference Database 101

I	Introduction
II	Experimental data
III	Calculated data
IV	Data comparisons
V	Cost comparisons
VI	Input and output files
VII	Tutorials and Units
VIII	Links to other sites
IX	Feedback
X	Older CCCBDB versions
XII	Geometries
XIII	Vibrations
XIV	Reaction data
XV	Entropy data
XVI	Bibliographic data
XVII	Ion data
XVIII	Bad calculations
XIX	Index of properties
XX	H-bond dimers
XXI	Oddities

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IV.D.8.

Average Bond Length Differences by Model Chemistry

Calculated at CCSD(T)/TZVP

Species	Name	Bond type	Bond Length (Å)
			Experimental	unc.	Calculated	Difference	atom1	atom2
C4H10O	Methyl propyl ether	rCC	1.530		1.095	-0.435	5	13
C5H8O	Methyl cyclopropyl ketone	rCH	1.126		1.090	-0.036	3	7
C2H2O2	Ethanedial	rCH	1.132		1.104	-0.028	1	3
CH3CH2CH2CH3	Butane	rCH	1.117		1.097	-0.020	1	5
LiOH	lithium hydroxide	rOH	0.969		0.951	-0.018	1	3
C3F6	hexafluoropropene	rCF	1.329	±0.003	1.314	-0.015	1	4
C5H8	Ethenylcyclopropane	rCH	1.099		1.086	-0.013	1	6
H2Cl+	dihydrogen monochloride cation	rHCl	1.321	±0.000	1.308	-0.012	1	2
B2H6	Diborane	rBH	1.200		1.189	-0.011	1	5
CH3CH2CHO	Propanal	rCH	1.103		1.092	-0.011	1	6
HSe	Selenium monohydride	rSeH	1.475	±0.010	1.464	-0.011	1	2
SiH2Cl2	dichlorosilane	rSiH	1.480	±0.015	1.470	-0.010	1	2
HF+	hydrogen fluoride cation	rHF	1.014		1.004	-0.010	1	2
CH2NH	Methanimine	rCH	1.103		1.094	-0.009	1	3
AsH	Arsenic monohydride	rAsH	1.535	±0.001	1.526	-0.009	1	2
HCCl	Chloromethylene	rCH	1.119	±0.036	1.111	-0.007	1	3
CH3CH2CHO	Propanal	rCH	1.105		1.098	-0.007	2	8
HeH+	Helium hydride cation	rHHe	0.790		0.784	-0.006	1	2
ArH+	Argon hydride cation	rArH	1.292	±0.000	1.286	-0.006	1	2
CH3CH2CHO	Propanal	rCH	1.115		1.109	-0.006	3	10
CH2	Methylene	rCH	1.085		1.079	-0.006	1	2
CH2PH	Phosphaethene	rCH	1.090	±0.015	1.084	-0.006	1	3
CH3CHO	Acetaldehyde	rCH	1.114		1.108	-0.006	1	4
HOCl	hypochlorous acid	rOH	0.973	±0.002	0.968	-0.005	1	2
C3H6O	2-Propen-1-ol	rCH	1.091	±0.010	1.086	-0.005	3	9
C3H6O	2-Propen-1-ol	rCH	1.092	±0.010	1.087	-0.005	2	7
B2H6	Diborane	rBH	1.320		1.315	-0.005	1	3
HClO4	perchloric acid	rOH	0.980		0.975	-0.005	3	6
CH2PH	Phosphaethene	rCH	1.090	±0.015	1.085	-0.005	1	4
KrH+	Protonated Krypton	rHKr	1.421	±0.000	1.417	-0.004	1	2
HS+	sulfur monohydride cation	rSH	1.374		1.370	-0.004	1	2
H2CSe	Selenoformaldehyde	rHC	1.090		1.086	-0.004	1	3
CH2CO	Ketene	rCH	1.083		1.079	-0.004	1	4
NH4+	ammonium cation	rHN	1.029	±0.000	1.025	-0.004	1	2
CH3CCH	propyne	rCH	1.096		1.092	-0.004	1	5
C2H	Ethynyl radical	rC#C	1.217		1.213	-0.004	1	2
HSiCl	Chlorosilylene	rSiH	1.525	±0.005	1.522	-0.003	1	3
CH3CH2CHO	Propanal	rCH	1.096		1.093	-0.003	1	5
CH3NH2	methyl amine	rNH	1.018	±0.001	1.015	-0.003	2	6
HBr+	hydrogen bromide cation	rHBr	1.448		1.445	-0.003	1	2
C3H6O	2-Propen-1-ol	rCH	1.102	±0.020	1.099	-0.003	1	6
C5H6	Propellane	rCC	1.525	±0.002	1.522	-0.003	1	2
C2H2O2	Ethanedial	rCC	1.526		1.524	-0.002	1	2
CH3NO	nitrosomethane	rCH	1.094		1.092	-0.002	1	4
CH3NH2	methyl amine	rCN	1.471	±0.003	1.469	-0.002	1	2
CHF3	Methane, trifluoro-	rCH	1.091	±0.014	1.089	-0.002	1	2
HBr	hydrogen bromide	rHBr	1.414	±0.000	1.413	-0.002	1	2
H2Se	Hydrogen selenide	rSeH	1.460		1.459	-0.001	1	2
CH3CH2CH2CH3	Butane	rCC	1.531		1.530	-0.001	1	2
CH3CHFCH3	2-Fluoropropane	rCH	1.093	±0.006	1.092	-0.001	4	8
CH2Cl2	Methylene chloride	rCH	1.085	±0.002	1.084	-0.001	1	2
C2H2ClF	1-chloro-1-fluoroethylene	rCH	1.082	±0.001	1.081	-0.001	2	5
CH3CHFCH3	2-Fluoropropane	rCH	1.094	±0.005	1.093	-0.001	4	10
CH3CHClCH3	Propane, 2-chloro-	rCH	1.091		1.091	0.000	2	5
CH3OC2H5	Ethane, methoxy-	rCO	1.415	±0.005	1.415	0.000	1	2
CH3OC2H5	Ethane, methoxy-	rCH	1.099	±0.007	1.099	0.000	1	6
C3H6	Cyclopropane	rCH	1.083		1.083	0.000	1	4
NH2SH	Thiohydroxylamine	rSH	1.344	±0.029	1.344	0.000	2	3
CH3OC2H5	Ethane, methoxy-	rCH	1.092	±0.007	1.092	0.000	4	11
BH3	boron trihydride	rBH	1.190		1.190	0.000	1	2
SiH3F	monofluorosilane	rSiH	1.476		1.477	0.001	1	3
CH3NO	nitrosomethane	rCH	1.092		1.093	0.001	1	5
C4H8	cyclobutane	rCH	1.093		1.094	0.001	1	5
BH	Boron monohydride	rBH	1.232		1.233	0.001	1	2
CH2CHF	Ethene, fluoro-	rCH	1.082		1.083	0.001	1	4
C2H2	Acetylene	rCH	1.063		1.064	0.001	1	3
H2	Hydrogen diatomic	rHH	0.741		0.743	0.001	1	2
NO	Nitric oxide	rN=O	1.154	±0.000	1.155	0.001	1	2
SiH3Cl	chlorosilane	rSiH	1.475		1.476	0.001	1	3
C3H4	cyclopropene	rCH	1.088		1.089	0.001	1	6
CH3OC2H5	Ethane, methoxy-	rCH	1.100	±0.003	1.101	0.001	3	8
AsH3	Arsine	rAsH	1.511	±0.000	1.512	0.001	1	2
C2H2+	acetylene cation	rC=C	1.253	±0.001	1.254	0.001	1	2
C4H8	cyclobutane	rCH	1.091		1.093	0.002	1	6
BeH2	beryllium dihydride	rBeH	1.326	±0.000	1.328	0.002	1	2
OCSe	Carbonyl selenide	rC=O	1.159		1.161	0.002	1	2
SiH4	Silane	rSiH	1.480	±0.000	1.482	0.002	1	2
CF3COOH	trifluoroacetic acid	rCC	1.546	±0.005	1.548	0.002	1	2
C3H6O	2-Propen-1-ol	rCH	1.096	±0.030	1.098	0.002	1	5
GeH	germylidene	rGeH	1.588		1.590	0.002	1	2
CH3CH2CHO	Propanal	rCC	1.523		1.525	0.002	1	2
C3H3NO	Oxazole	rCH	1.075	±0.001	1.078	0.003	4	7
BeH	beryllium monohydride	rBeH	1.343		1.345	0.003	1	2
C3H3NO	Oxazole	rCH	1.073	±0.001	1.076	0.003	5	8
C2H2+	acetylene cation	rCH	1.077	±0.005	1.080	0.003	1	3
CH	Methylidyne	rCH	1.120		1.123	0.003	1	2
C3H3NO	Oxazole	rCH	1.075	±0.001	1.078	0.003	2	6
CH3CHClCH3	Propane, 2-chloro-	rCH	1.092		1.095	0.003	3	6
CH4	Methane	rCH	1.087	±0.001	1.090	0.003	1	2
CH3CHFCH3	2-Fluoropropane	rCH	1.092		1.095	0.003	1	3
CH3CH2CHO	Propanal	rCC	1.509		1.512	0.003	2	3
C5H6	Propellane	rCC	1.596	±0.005	1.599	0.003	2	5
CH3Br	methyl bromide	rCH	1.082	±0.001	1.086	0.004	1	3
C3H3NO	Oxazole	rCO	1.357	±0.003	1.361	0.004	1	2
CH3CCH	propyne	rCH	1.060		1.064	0.004	3	4
C3H4	cyclopropene	rCH	1.072		1.076	0.004	2	4
N3	azide radical	rNN	1.181		1.185	0.004	1	2
H2O	Water	rOH	0.958	±0.000	0.962	0.004	1	2
CH3CHO	Acetaldehyde	rCH	1.086		1.090	0.004	2	5
HF	Hydrogen fluoride	rHF	0.917	±0.000	0.921	0.004	1	2
HO2	Hydroperoxy radical	rOH	0.971		0.975	0.004	1	3
CH3OC2H5	Ethane, methoxy-	rCH	1.086	±0.010	1.091	0.005	1	5
HCl+	hydrogen chloride cation	rHCl	1.315		1.319	0.005	1	2
SiH+	silicon monohydride cation	rSiH	1.504		1.509	0.005	1	2
He2+	helium diatomic cation	rHeHe	1.081	±0.001	1.086	0.005	1	2
CH3OC2H5	Ethane, methoxy-	rCH	1.089	±0.008	1.094	0.005	4	10
C5H8	Ethenylcyclopropane	rCC	1.475		1.480	0.005	1	2
CO+	carbon monoxide cation	rC=O	1.115	±0.000	1.120	0.005	1	2
C3F6	hexafluoropropene	rC=C	1.329	±0.003	1.334	0.005	1	2
CH2CHF	Ethene, fluoro-	rCH	1.077		1.082	0.005	2	5
FNO2	Nitryl fluoride	rN=O	1.180	±0.005	1.186	0.006	1	3
OH	Hydroxyl radical	rOH	0.970		0.975	0.006	1	2
NO+	nitric oxide cation	rN=O	1.066		1.072	0.006	1	2
C3H6O	2-Propen-1-ol	rCH	1.078	±0.010	1.084	0.006	3	8
CH2CO	Ketene	rC=O	1.162		1.168	0.006	2	3
C3H3NO	Oxazole	rCO	1.370	±0.002	1.376	0.006	1	5
CH3CHFCH3	2-Fluoropropane	rCH	1.088	±0.006	1.094	0.006	4	6
C5H8O	Methyl cyclopropyl ketone	rCC	1.510		1.516	0.006	2	3
CH3NH2	methyl amine	rCH	1.093	±0.000	1.099	0.006	1	3
HCl	Hydrogen chloride	rHCl	1.275	±0.000	1.281	0.006	1	2
CF	Fluoromethylidyne	rCF	1.276		1.282	0.006	1	2
HNCNH	diiminomethane	rC=N	1.224	±0.001	1.230	0.006	1	2
CN-	cyanide anion	rC#N	1.177	±0.004	1.183	0.006	1	2
ScH	Scandium monohydride	rScH	1.775	±0.000	1.782	0.006	1	2
OH-	hydroxide anion	rOH	0.964		0.970	0.006	1	2
SiH2F2	difluorosilane	rSiH	1.462		1.468	0.006	1	4
SiH3+	Silyl cation	rSiH	1.460	±0.010	1.467	0.007	1	2
C2H3	vinyl	rCH	1.085		1.092	0.007	2	4
HOBr	Hypobromous acid	rOH	0.961		0.968	0.007	1	2
GeH3F	monofluorogermane	rGeH	1.515	±0.000	1.521	0.007	1	3
C2	Carbon diatomic	rC=C	1.243		1.249	0.007	1	2
C4H6	Bicyclo[1.1.0]butane	rCC	1.497		1.504	0.007	1	2
CH2F2	Methane, difluoro-	rCH	1.084	±0.003	1.091	0.007	1	2
N2	Nitrogen diatomic	rN#N	1.098		1.105	0.007	1	2
HS	Mercapto radical	rSH	1.341		1.348	0.007	1	2
C2H2	Acetylene	rC#C	1.203		1.210	0.008	1	2
CO	Carbon monoxide	rC#O	1.128	±0.000	1.136	0.008	1	2
B2	Boron diatomic	rBB	1.590		1.598	0.008	1	2
CF3COOH	trifluoroacetic acid	rC=O	1.192	±0.003	1.200	0.008	2	4
SiH	Silylidyne	rSiH	1.520		1.529	0.009	1	2
NH3BF3	Amminetrifluoroboron	rBN	1.673		1.682	0.009	1	2
HS-	mercapto anion	rSH	1.343		1.352	0.009	1	2
BF	Boron monofluoride	rBF	1.267	±0.000	1.276	0.009	1	2
BF3	Borane, trifluoro-	rBF	1.307		1.316	0.009	1	2
O2+	diatomic oxygen cation	rOO	1.116		1.125	0.009	1	2
C3H6	Cyclopropane	rCC	1.501		1.510	0.009	1	2
CHF3	Methane, trifluoro-	rCF	1.328	±0.003	1.338	0.009	1	3
CH2F2	Methane, difluoro-	rCF	1.351	±0.001	1.360	0.010	1	4
PH	phosphorus monohydride	rPH	1.422		1.432	0.010	1	2
O2	Oxygen diatomic	rO=O	1.208		1.218	0.010	1	2
OCSe	Carbonyl selenide	rC=Se	1.709		1.720	0.011	1	3
CSe2	Carbon diselenide	rC=Se	1.692	±0.000	1.703	0.011	1	2
BN	boron nitride	rB=N	1.325		1.336	0.011	1	2
SCSe	Carbon sulfide selenide	rC=Se	1.695	±0.002	1.706	0.011	1	3
BO	boron monoxide	rB=O	1.205		1.216	0.012	1	2
CSe	Carbon monoselenide	rC=Se	1.676	±0.000	1.688	0.012	1	2
LiH	Lithium Hydride	rLiH	1.595	±0.000	1.607	0.012	1	2
H2CSe	Selenoformaldehyde	rC=Se	1.753		1.765	0.012	1	2
CH3OC2H5	Ethane, methoxy-	rCO	1.407	±0.004	1.419	0.012	2	3
MgH	magnesium monohydride	rMgH	1.730		1.742	0.013	1	2
CH3CSNH2	Ethanethioamide	rC=S	1.647	±0.002	1.660	0.013	1	2
CBr4	Carbon tetrabromide	rCBr	1.942	±0.002	1.955	0.013	1	2
SCSe	Carbon sulfide selenide	rC=S	1.553	±0.002	1.567	0.014	1	2
FNO2	Nitryl fluoride	rNF	1.467	±0.015	1.481	0.014	1	2
HO2	Hydroperoxy radical	rOO	1.331		1.345	0.014	1	2
FO	Oxygen monofluoride	rFO	1.354		1.370	0.015	1	2
SiC	silicon monocarbide	rCSi	1.722		1.738	0.017	1	2
GaF	Gallium monofluoride	rFGa	1.774	±0.000	1.791	0.017	1	2
SeO2	Selenium dioxide	rSeO	1.607	±0.001	1.624	0.017	1	2
LiNH2	lithium amide	rLiN	1.736	±0.003	1.754	0.018	1	2
GeF+	Germanium monofluoride cation	rFGe	1.665	±0.000	1.683	0.018	1	2
HNO3	Nitric acid	rNO	1.406		1.424	0.018	1	2
GeO	Germanium monoxide	rOGe	1.625		1.643	0.018	1	2
C2H	Ethynyl radical	rCH	1.047		1.065	0.019	1	3
C3H5	Allyl radical	rCH	1.069		1.088	0.019	1	2
GeBr4	Germanium tetrabromide	rGeBr	2.272	±0.001	2.291	0.019	1	2
H2CS	Thioformaldehyde	rC=S	1.611		1.630	0.019	1	2
GeH3F	monofluorogermane	rGeF	1.731	±0.000	1.750	0.019	1	2
CH2Br2	dibromomethane	rCBr	1.925	±0.002	1.944	0.019	1	4
SeO	Selenium monoxide	rSeO	1.639	±0.001	1.659	0.020	1	2
CH2Cl2	Methylene chloride	rCCl	1.767	±0.002	1.787	0.020	1	4
C3O2	Carbon suboxide	rC=O	1.146		1.167	0.021	2	4
F2	Fluorine diatomic	rFF	1.412		1.433	0.021	1	2
AlCl	Aluminum monochloride	rAlCl	2.130	±0.000	2.151	0.021	1	2
SiP	Silicon monophosphide	rSiP	2.078	±0.002	2.099	0.021	1	2
GeF	Germanium monofluoride	rFGe	1.745		1.767	0.022	1	2
HCCl	Chloromethylene	rCCl	1.696	±0.003	1.719	0.023	1	2
CH3Br	methyl bromide	rCBr	1.934	±0.000	1.957	0.023	1	2
LiOH	lithium hydroxide	rLiO	1.582		1.605	0.023	1	2
CrH	Chromium hydride	rHCr	1.655	±0.001	1.678	0.023	1	2
GaBr	Gallium monobromide	rGaBr	2.352	±0.000	2.376	0.024	1	2
PN	Phosphorus mononitride	rP#N	1.491		1.515	0.024	1	2
GeS	Germanium monosulfide	rS=Ge	2.012	±0.000	2.037	0.025	1	2
AlC	Aluminum carbide	rC=Al	1.955		1.980	0.025	1	2
C3O2	Carbon suboxide	rC=C	1.251		1.276	0.025	1	2
GeCl	Germanium monochloride	rClGe	2.164	±0.000	2.189	0.026	1	2
AlNC	Aluminum isocyanide	rAlN	1.855	±0.005	1.881	0.027	1	2
SiH3Cl	chlorosilane	rSiCl	2.051		2.078	0.027	1	2
AsF	Arsenic monofluoride	rFAs	1.736	±0.001	1.764	0.028	1	2
C5H8O	Cyclopentanone	rCC	1.504		1.532	0.028	2	3
SiS	silicon monosulfide	rSiS	1.929	±0.000	1.958	0.029	1	2
SiO	Silicon monoxide	rSiO	1.510	±0.000	1.539	0.029	1	2
SiH2Cl2	dichlorosilane	rSiCl	2.033	±0.003	2.063	0.030	1	4
As4	Arsenic tetramer	rAsAs	2.435		2.465	0.030	1	2
C2H6O2S	Dimethyl sulfone	rCS	1.777	±0.006	1.807	0.030	1	4
NaH	sodium hydride	rNaH	1.887	±0.000	1.917	0.030	1	2
NS	Mononitrogen monosulfide	rNS	1.497	±0.000	1.528	0.031	1	2
BeO	beryllium oxide	rBe=O	1.331		1.363	0.032	1	2
HOBr	Hypobromous acid	rBrO	1.834		1.866	0.032	2	3
SiH3F	monofluorosilane	rSiF	1.595		1.627	0.032	1	2
AlF	Aluminum monofluoride	rAlF	1.654	±0.000	1.687	0.032	1	2
P2	Phosphorus diatomic	rP#P	1.893		1.926	0.033	1	2
SiCl	Clorosilylidyne	rSiCl	2.061	±0.000	2.095	0.034	1	2
Li2	Lithium diatomic	rLiLi	2.673		2.707	0.034	1	2
SOF4	Sulfur tetrafluoride oxide	rFS	1.596	±0.003	1.631	0.035	1	3
HSiCl	Chlorosilylene	rSiCl	2.067	±0.003	2.102	0.035	1	2
ClO	Monochlorine monoxide	rClO	1.596	±0.001	1.632	0.036	1	2
SiF	silicon monofluoride	rSiF	1.604		1.641	0.036	1	2
SiF2	Silicon difluoride	rFSi	1.590	±0.000	1.627	0.037	1	2
PF2	Phosphorus difluoride	rPF	1.579		1.616	0.037	1	2
F2SO	Thionyl Fluoride	rO=S	1.413	±0.000	1.449	0.037	1	2
SeCl2	Selenium Dichloride	rClSe	2.157	±0.003	2.194	0.037	1	2
SF4	Sulfur tetrafluoride	rSF	1.646	±0.003	1.683	0.037	1	2
HOCl	hypochlorous acid	rClO	1.697	±0.001	1.734	0.037	1	3
Se2	Selenium diatomic	rSe=Se	2.166	±0.001	2.204	0.038	1	2
SF4	Sulfur tetrafluoride	rSF	1.545	±0.003	1.583	0.038	1	4
PS	phosphorus sulfide	rP=S	1.900		1.939	0.039	1	2
BrF	Bromine monofluoride	rFBr	1.759	±0.000	1.799	0.040	1	2
SF	Monosulfur monofluoride	rSF	1.599		1.640	0.040	1	2
SO	Sulfur monoxide	rS=O	1.481		1.522	0.041	1	2
GaAs	Gallium arsenide	rGa#As	2.530	±0.020	2.572	0.042	1	2
LiCl	lithium chloride	rLiCl	2.021	±0.000	2.063	0.042	1	2
SOF4	Sulfur tetrafluoride oxide	rFS	1.539	±0.003	1.583	0.044	1	5
HClO4	perchloric acid	rO=Cl	1.414	±0.001	1.458	0.044	1	2
S2	Sulfur diatomic	rS=S	1.889		1.934	0.045	1	2
BrO	Bromine monoxide	rOBr	1.718		1.763	0.045	1	2
LiO	lithium oxide	rLiO	1.688		1.733	0.045	1	2
LiF	lithium fluoride	rLiF	1.564	±0.000	1.609	0.045	1	2
LiBr	Lithium Bromide	rLiBr	2.170	±0.000	2.216	0.046	1	2
C2H6O2S	Dimethyl sulfone	rS=O	1.431	±0.004	1.477	0.046	1	2
SSO	Disulfur monoxide	rS=O	1.456		1.502	0.046	1	2
NaCl	Sodium Chloride	rNaCl	2.361	±0.000	2.407	0.046	1	2
HSSSH	trisulfane	rSS	2.054	±0.000	2.101	0.047	1	2
ClF	Chlorine monofluoride	rFCl	1.628	±0.000	1.675	0.047	1	2
CFCl	chlorofluoromethylene	rCCl	1.714		1.762	0.048	1	3
F2SO	Thionyl Fluoride	rFS	1.585	±0.000	1.634	0.049	1	3
NaF	sodium fluoride	rNaF	1.926	±0.000	1.977	0.051	1	2
SCl2	Sulfur dichloride	rSCl	2.013	±0.001	2.068	0.055	1	2
SSO	Disulfur monoxide	rS=S	1.884		1.939	0.055	2	3
TiCl	Titanium Monochloride	rClTi	2.265	±0.000	2.320	0.055	1	2
Br2	Bromine diatomic	rBrBr	2.281		2.338	0.057	1	2
BrCl	Bromine monochloride	rClBr	2.136	±0.000	2.195	0.059	1	2
SCl	sulfur monochloride	rSCl	1.975		2.035	0.060	1	2
Cl2	Chlorine diatomic	rClCl	1.988		2.050	0.062	1	2
ClOF3	Chlorine trifluoride oxide	rFCl	1.713	±0.003	1.776	0.063	1	4
HClO4	perchloric acid	rO=Cl	1.404	±0.001	1.469	0.065	1	4
HClO4	perchloric acid	rOCl	1.641	±0.002	1.710	0.069	1	3
NaLi	lithium sodium	rLiNa	2.889		2.968	0.079	1	2
ClOF3	Chlorine trifluoride oxide	rFCl	1.603	±0.004	1.695	0.092	1	3
KH	Potassium hydride	rKH	2.243	±0.001	2.388	0.146	1	2
CaH	Calcium monohydride	rCaH	2.003	±0.000	2.175	0.173	1	2
Al2Cl6	Aluminum, di-μ-chlorotetrachlorodi-	rAlCl	2.040	±0.040	2.278	0.238	1	3
C4H10O	Methyl propyl ether	rCH	1.099		1.416	0.317	1	2
CaO	Calcium monoxide	rOCa	1.822		2.193	0.371	1	2

264 molecules.