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	hartrees
Energy at 0K	-377.762983
Energy at 298.15K	-377.765982
HF Energy	-377.014989
Nuclear repulsion energy	267.389767

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3291	3127	0.15
2	A₁	1756	1669	25.24
3	A₁	1606	1526	2.55
4	A₁	1201	1141	68.89
5	A₁	1082	1028	75.06
6	A₁	823	781	14.08
7	A₁	608	578	0.82
8	A₁	377	358	7.04
9	A₂	891	847	0.00
10	A₂	673	640	0.00
11	A₂	255	242	0.00
12	B₁	795	755	90.89
13	B₁	591	561	0.78
14	B₁	156	148	1.18
15	B₂	3268	3105	0.53
16	B₂	1696	1612	281.42
17	B₂	1354	1286	1.96
18	B₂	1036	984	54.46
19	B₂	795	755	133.91
20	B₂	683	649	110.81
21	B₂	537	510	22.47

Atom	y (Å)	z (Å)
O1	0.000	1.010
C2	1.172	0.150
C3	-1.172	0.150
O4	2.323	0.598
O5	-2.323	0.598
C6	0.678	-1.268
C7	-0.678	-1.268
H8	1.355	-2.117
H9	-1.355	-2.117

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4535	1.4535	2.3595	2.3595	2.3768	2.3768	3.4070	3.4070
C2	1.4535		2.3448	1.2351	3.5244	1.5025	2.3320	2.2744	3.3949
C3	1.4535	2.3448		3.5244	1.2351	2.3320	1.5025	3.3949	2.2744
O4	2.3595	1.2351	3.5244		4.6468	2.4883	3.5348	2.8827	4.5715
O5	2.3595	3.5244	1.2351	4.6468		3.5348	2.4883	4.5715	2.8827
C6	2.3768	1.5025	2.3320	2.4883	3.5348		1.3564	1.0848	2.2026
C7	2.3768	2.3320	1.5025	3.5348	2.4883	1.3564		2.2026	1.0848
H8	3.4070	2.2744	3.3949	2.8827	4.5715	1.0848	2.2026		2.7091
H9	3.4070	3.3949	2.2744	4.5715	2.8827	2.2026	1.0848	2.7091

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.504	O1	C2	C6	107.028
O1	C3	O5	122.504	O1	C3	C7	107.028
C2	O1	C3	107.537	C2	C6	C7	109.204
C2	C6	H8	122.226	C3	C7	C6	109.204
C3	C7	H9	122.226	O4	C2	C6	130.469
O5	C3	C7	130.469	C6	C7	H9	128.570
C7	C6	H8	128.570

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

using model chemistry: MP2=FULL/6-31G

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/6-31G

States and conformations

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