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	hartrees
Energy at 0K	-372.678803
Energy at 298.15K	-372.681586
HF Energy	-372.261993
Nuclear repulsion energy	265.120840

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3564	3168	6.45
2	A₁	1838	1633	3.25
3	A₁	1705	1516	2.75
4	A₁	1293	1149	99.79
5	A₁	1133	1007	9.39
6	A₁	861	766	0.42
7	A₁	645	573	0.41
8	A₁	383	341	7.64
9	A₂	1021	908	0.00
10	A₂	723	643	0.00
11	A₂	274	244	0.00
12	B₁	838	745	30.43
13	B₁	575	511	2.53
14	B₁	148	131	0.44
15	B₂	3534	3142	13.12
16	B₂	1768	1572	88.95
17	B₂	1424	1266	0.10
18	B₂	1146	1018	142.89
19	B₂	949	843	38.98
20	B₂	729	648	3.04
21	B₂	545	484	2.16

Atom	y (Å)	z (Å)
O1	0.000	1.018
C2	1.161	0.157
C3	-1.161	0.157
O4	2.324	0.625
O5	-2.324	0.625
C6	0.675	-1.308
C7	-0.675	-1.308
H8	1.367	-2.162
H9	-1.367	-2.162

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4445	1.4445	2.3574	2.3574	2.4220	2.4220	3.4611	3.4611
C2	1.4445		2.3210	1.2543	3.5161	1.5442	2.3490	2.3289	3.4305
C3	1.4445	2.3210		3.5161	1.2543	2.3490	1.5442	3.4305	2.3289
O4	2.3574	1.2543	3.5161		4.6488	2.5414	3.5685	2.9471	4.6253
O5	2.3574	3.5161	1.2543	4.6488		3.5685	2.5414	4.6253	2.9471
C6	2.4220	1.5442	2.3490	2.5414	3.5685		1.3499	1.0989	2.2130
C7	2.4220	2.3490	1.5442	3.5685	2.5414	1.3499		2.2130	1.0989
H8	3.4611	2.3289	3.4305	2.9471	4.6253	1.0989	2.2130		2.7334
H9	3.4611	3.4305	2.3289	4.6253	2.9471	2.2130	1.0989	2.7334

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	121.575	O1	C2	C6	108.218
O1	C3	O5	121.575	O1	C3	C7	108.218
C2	O1	C3	106.911	C2	C6	C7	108.326
C2	C6	H8	122.661	C3	C7	C6	108.326
C3	C7	H9	122.661	O4	C2	C6	130.207
O5	C3	C7	130.207	C6	C7	H9	129.013
C7	C6	H8	129.013

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

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

States and conformations

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