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	hartrees
Energy at 0K	-372.676815
Energy at 298.15K	-372.679597
HF Energy	-372.261911
Nuclear repulsion energy	265.091458

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3563	3107	6.44
2	A₁	1837	1602	3.25
3	A₁	1704	1486	2.74
4	A₁	1292	1127	99.85
5	A₁	1132	987	9.41
6	A₁	861	751	0.42
7	A₁	645	562	0.41
8	A₁	383	334	7.64
9	A₂	1021	890	0.00
10	A₂	723	630	0.00
11	A₂	274	239	0.00
12	B₁	838	731	30.46
13	B₁	575	501	2.54
14	B₁	148	129	0.44
15	B₂	3534	3081	13.14
16	B₂	1768	1541	89.09
17	B₂	1424	1242	0.09
18	B₂	1145	999	142.88
19	B₂	949	827	38.98
20	B₂	728	635	3.04
21	B₂	545	475	2.16

Atom	y (Å)	z (Å)
O1	0.000	1.018
C2	1.161	0.157
C3	-1.161	0.157
O4	2.325	0.625
O5	-2.325	0.625
C6	0.675	-1.309
C7	-0.675	-1.309
H8	1.367	-2.163
H9	-1.367	-2.163

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4446	1.4446	2.3575	2.3575	2.4223	2.4223	3.4616	3.4616
C2	1.4446		2.3213	1.2543	3.5164	1.5445	2.3494	2.3292	3.4309
C3	1.4446	2.3213		3.5164	1.2543	2.3494	1.5445	3.4309	2.3292
O4	2.3575	1.2543	3.5164		4.6492	2.5417	3.5689	2.9475	4.6258
O5	2.3575	3.5164	1.2543	4.6492		3.5689	2.5417	4.6258	2.9475
C6	2.4223	1.5445	2.3494	2.5417	3.5689		1.3501	1.0990	2.2133
C7	2.4223	2.3494	1.5445	3.5689	2.5417	1.3501		2.2133	1.0990
H8	3.4616	2.3292	3.4309	2.9475	4.6258	1.0990	2.2133		2.7338
H9	3.4616	3.4309	2.3292	4.6258	2.9475	2.2133	1.0990	2.7338

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	121.576	O1	C2	C6	108.218
O1	C3	O5	121.576	O1	C3	C7	108.218
C2	O1	C3	106.914	C2	C6	C7	108.324
C2	C6	H8	122.659	C3	C7	C6	108.324
C3	C7	H9	122.659	O4	C2	C6	130.206
O5	C3	C7	130.206	C6	C7	H9	129.017
C7	C6	H8	129.017

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

using model chemistry: MP2/STO-3G

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/STO-3G

States and conformations

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