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	hartrees
Energy at 0K	-378.421059
Energy at 298.15K	-378.424281
HF Energy	-377.316060
Nuclear repulsion energy	274.471173

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3298	3134	0.72
2	A₁	1897	1803	42.36
3	A₁	1635	1553	3.17
4	A₁	1283	1219	163.07
5	A₁	1075	1022	22.06
6	A₁	881	837	5.63
7	A₁	632	600	0.60
8	A₁	404	384	9.57
9	A₂	943	896	0.00
10	A₂	753	715	0.00
11	A₂	236	224	0.00
12	B₁	846	803	72.07
13	B₁	635	603	0.01
14	B₁	159	151	1.91
15	B₂	3276	3113	1.00
16	B₂	1843	1752	450.99
17	B₂	1334	1268	0.24
18	B₂	1068	1015	92.74
19	B₂	920	874	152.95
20	B₂	702	667	38.64
21	B₂	559	531	6.83

Atom	y (Å)	z (Å)
O1	0.000	0.973
C2	1.129	0.161
C3	-1.129	0.161
O4	2.243	0.599
O5	-2.243	0.599
C6	0.670	-1.259
C7	-0.670	-1.259
H8	1.363	-2.090
H9	-1.363	-2.090

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3912	1.3912	2.2739	2.2739	2.3307	2.3307	3.3523	3.3523
C2	1.3912		2.2589	1.1965	3.4007	1.4924	2.2924	2.2624	3.3582
C3	1.3912	2.2589		3.4007	1.1965	2.2924	1.4924	3.3582	2.2624
O4	2.2739	1.1965	3.4007		4.4858	2.4342	3.4551	2.8284	4.4980
O5	2.2739	3.4007	1.1965	4.4858		3.4551	2.4342	4.4980	2.8284
C6	2.3307	1.4924	2.2924	2.4342	3.4551		1.3403	1.0816	2.1965
C7	2.3307	2.2924	1.4924	3.4551	2.4342	1.3403		2.1965	1.0816
H8	3.3523	2.2624	3.3582	2.8284	4.4980	1.0816	2.1965		2.7267
H9	3.3523	3.3582	2.2624	4.4980	2.8284	2.1965	1.0816	2.7267

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.806	O1	C2	C6	107.800
O1	C3	O5	122.806	O1	C3	C7	107.800
C2	O1	C3	108.553	C2	C6	C7	107.924
C2	C6	H8	122.218	C3	C7	C6	107.924
C3	C7	H9	122.218	O4	C2	C6	129.394
O5	C3	C7	129.394	C6	C7	H9	129.858
C7	C6	H8	129.858

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

using model chemistry: MP2/6-311G**

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: MP2/6-311G**

States and conformations

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