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	hartrees
Energy at 0K	-378.261632
Energy at 298.15K	-378.264821
HF Energy	-377.226047
Nuclear repulsion energy	273.630792

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3351	3139	0.81
2	A₁	1902	1782	39.74
3	A₁	1661	1556	3.22
4	A₁	1294	1212	152.15
5	A₁	1100	1030	22.04
6	A₁	884	827	7.85
7	A₁	631	591	0.22
8	A₁	398	373	10.05
9	A₂	939	879	0.00
10	A₂	725	679	0.00
11	A₂	240	224	0.00
12	B₁	835	782	73.56
13	B₁	629	589	0.76
14	B₁	161	151	2.30
15	B₂	3331	3119	1.22
16	B₂	1848	1731	411.31
17	B₂	1365	1278	0.32
18	B₂	1089	1020	88.74
19	B₂	913	855	152.17
20	B₂	707	662	33.57
21	B₂	558	523	5.38

Atom	y (Å)	z (Å)
O1	0.000	0.976
C2	1.134	0.157
C3	-1.134	0.157
O4	2.256	0.599
O5	-2.256	0.599
C6	0.670	-1.257
C7	-0.670	-1.257
H8	1.356	-2.088
H9	-1.356	-2.088

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3986	1.3986	2.2875	2.2875	2.3308	2.3308	3.3506	3.3506
C2	1.3986		2.2672	1.2064	3.4185	1.4875	2.2914	2.2559	3.3522
C3	1.3986	2.2672		3.4185	1.2064	2.2914	1.4875	3.3522	2.2559
O4	2.2875	1.2064	3.4185		4.5123	2.4410	3.4648	2.8338	4.5018
O5	2.2875	3.4185	1.2064	4.5123		3.4648	2.4410	4.5018	2.8338
C6	2.3308	1.4875	2.2914	2.4410	3.4648		1.3399	1.0779	2.1898
C7	2.3308	2.2914	1.4875	3.4648	2.4410	1.3399		2.1898	1.0779
H8	3.3506	2.2559	3.3522	2.8338	4.5018	1.0779	2.1898		2.7116
H9	3.3506	3.3522	2.2559	4.5018	2.8338	2.1898	1.0779	2.7116

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.659	O1	C2	C6	107.687
O1	C3	O5	122.659	O1	C3	C7	107.687
C2	O1	C3	108.302	C2	C6	C7	108.162
C2	C6	H8	122.322	C3	C7	C6	108.162
C3	C7	H9	122.322	O4	C2	C6	129.654
O5	C3	C7	129.654	C6	C7	H9	129.516
C7	C6	H8	129.516

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

using model chemistry: MP2/6-31G**

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: MP2/6-31G**

States and conformations

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