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	hartrees
Energy at 0K	-375.835703
Energy at 298.15K
HF Energy	-375.094322
Nuclear repulsion energy	268.897407

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3263	3163	0.20
2	A₁	1854	1797	31.38
3	A₁	1632	1581	0.85
4	A₁	1194	1158	65.03
5	A₁	1082	1049	90.37
6	A₁	802	777	1.81
7	A₁	625	606	0.07
8	A₁	384	373	7.96
9	A₂	967	937	0.00
10	A₂	744	721	0.00
11	A₂	281	272	0.00
12	B₁	857	831	100.34
13	B₁	625	606	0.54
14	B₁	163	158	0.58
15	B₂	3239	3139	0.61
16	B₂	1774	1720	347.08
17	B₂	1349	1307	6.13
18	B₂	1007	976	89.43
19	B₂	860	833	122.73
20	B₂	705	683	38.67
21	B₂	540	523	6.31

Atom	y (Å)	z (Å)
O1	0.000	0.999
C2	1.166	0.158
C3	-1.166	0.158
O4	2.299	0.606
O5	-2.299	0.606
C6	0.671	-1.278
C7	-0.671	-1.278
H8	1.352	-2.120
H9	-1.352	-2.120

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4377	1.4377	2.3324	2.3324	2.3740	2.3740	3.3994	3.3994
C2	1.4377		2.3327	1.2178	3.4941	1.5194	2.3326	2.2860	3.3961
C3	1.4377	2.3327		3.4941	1.2178	2.3326	1.5194	3.3961	2.2860
O4	2.3324	1.2178	3.4941		4.5981	2.4895	3.5174	2.8855	4.5563
O5	2.3324	3.4941	1.2178	4.5981		3.5174	2.4895	4.5563	2.8855
C6	2.3740	1.5194	2.3326	2.4895	3.5174		1.3429	1.0826	2.1917
C7	2.3740	2.3326	1.5194	3.5174	2.4895	1.3429		2.1917	1.0826
H8	3.3994	2.2860	3.3961	2.8855	4.5563	1.0826	2.1917		2.7041
H9	3.3994	3.3961	2.2860	4.5563	2.8855	2.1917	1.0826	2.7041

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.675	O1	C2	C6	106.769
O1	C3	O5	122.675	O1	C3	C7	106.769
C2	O1	C3	108.443	C2	C6	C7	109.009
C2	C6	H8	122.040	C3	C7	C6	109.009
C3	C7	H9	122.040	O4	C2	C6	130.556
O5	C3	C7	130.556	C6	C7	H9	128.951
C7	C6	H8	128.951

All results from a given calculation for C₄H₂O₃ (Maleic Anhydride)

using model chemistry: QCISD/3-21G

States and conformations

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for C4H2O3 (Maleic Anhydride)

using model chemistry: QCISD/3-21G

States and conformations

All results from a given calculation for C₄H₂O₃ (Maleic Anhydride)