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	hartrees
Energy at 0K	-375.830861
Energy at 298.15K	-375.834030
HF Energy	-375.092400
Nuclear repulsion energy	268.455477

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3307	3157	0.49
2	A₁	1800	1718	21.76
3	A₁	1614	1541	2.13
4	A₁	1195	1141	49.05
5	A₁	1079	1030	110.35
6	A₁	801	765	2.48
7	A₁	619	591	0.04
8	A₁	383	366	5.83
9	A₂	969	925	0.00
10	A₂	752	718	0.00
11	A₂	282	270	0.00
12	B₁	864	825	96.90
13	B₁	628	600	0.07
14	B₁	164	157	0.42
15	B₂	3282	3134	0.69
16	B₂	1727	1649	246.07
17	B₂	1359	1298	7.27
18	B₂	987	942	58.99
19	B₂	828	791	143.13
20	B₂	692	660	62.87
21	B₂	539	515	11.42

Atom	y (Å)	z (Å)
O1	0.000	1.004
C2	1.168	0.155
C3	-1.168	0.155
O4	2.308	0.602
O5	-2.308	0.602
C6	0.672	-1.274
C7	-0.672	-1.274
H8	1.347	-2.117
H9	-1.347	-2.117

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4440	1.4440	2.3424	2.3424	2.3750	2.3750	3.3987	3.3987
C2	1.4440		2.3367	1.2239	3.5047	1.5131	2.3299	2.2787	3.3893
C3	1.4440	2.3367		3.5047	1.2239	2.3299	1.5131	3.3893	2.2787
O4	2.3424	1.2239	3.5047		4.6154	2.4894	3.5210	2.8834	4.5550
O5	2.3424	3.5047	1.2239	4.6154		3.5210	2.4894	4.5550	2.8834
C6	2.3750	1.5131	2.3299	2.4894	3.5210		1.3433	1.0797	2.1874
C7	2.3750	2.3299	1.5131	3.5210	2.4894	1.3433		2.1874	1.0797
H8	3.3987	2.2787	3.3893	2.8834	4.5550	1.0797	2.1874		2.6941
H9	3.3987	3.3893	2.2787	4.5550	2.8834	2.1874	1.0797	2.6941

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.583	O1	C2	C6	106.833
O1	C3	O5	122.583	O1	C3	C7	106.833
C2	O1	C3	108.009	C2	C6	C7	109.162
C2	C6	H8	122.116	C3	C7	C6	109.162
C3	C7	H9	122.116	O4	C2	C6	130.584
O5	C3	C7	130.584	C6	C7	H9	128.722
C7	C6	H8	128.722

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

using model chemistry: MP2=FULL/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: MP2=FULL/3-21G

States and conformations

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