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	hartrees
Energy at 0K	-375.830861
Energy at 298.15K	-375.834016
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	3135	0.49
2	A₁	1800	1706	21.76
3	A₁	1614	1530	2.13
4	A₁	1195	1133	49.05
5	A₁	1079	1023	110.35
6	A₁	801	760	2.48
7	A₁	619	587	0.04
8	A₁	383	363	5.83
9	A₂	969	919	0.00
10	A₂	752	713	0.00
11	A₂	282	268	0.00
12	B₁	864	819	96.90
13	B₁	628	595	0.07
14	B₁	164	156	0.42
15	B₂	3282	3111	0.69
16	B₂	1727	1637	246.07
17	B₂	1359	1288	7.27
18	B₂	987	935	58.99
19	B₂	828	785	143.13
20	B₂	692	656	62.87
21	B₂	539	511	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)