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	hartrees
Energy at 0K	-375.818722
Energy at 298.15K	-375.821875
HF Energy	-375.092309
Nuclear repulsion energy	268.420237

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3306	3145	0.48
2	A₁	1799	1712	21.81
3	A₁	1613	1535	2.12
4	A₁	1195	1137	48.92
5	A₁	1079	1026	110.48
6	A₁	801	762	2.49
7	A₁	619	589	0.04
8	A₁	383	364	5.84
9	A₂	968	921	0.00
10	A₂	752	715	0.00
11	A₂	282	268	0.00
12	B₁	863	821	96.98
13	B₁	628	597	0.07
14	B₁	164	156	0.42
15	B₂	3282	3122	0.67
16	B₂	1727	1643	246.28
17	B₂	1359	1293	7.27
18	B₂	986	938	58.68
19	B₂	827	787	143.05
20	B₂	691	658	63.25
21	B₂	539	513	11.53

Atom	y (Å)	z (Å)
O1	0.000	1.004
C2	1.169	0.155
C3	-1.169	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		1.4443	1.4443	2.3427	2.3427	2.3754	2.3754	3.3992	3.3992
C2	1.4443		2.3370	1.2240	3.5051	1.5133	2.3302	2.2789	3.3898
C3	1.4443	2.3370		3.5051	1.2240	2.3302	1.5133	3.3898	2.2789
O4	2.3427	1.2240	3.5051		4.6160	2.4897	3.5214	2.8836	4.5556
O5	2.3427	3.5051	1.2240	4.6160		3.5214	2.4897	4.5556	2.8836
C6	2.3754	1.5133	2.3302	2.4897	3.5214		1.3435	1.0798	2.1877
C7	2.3754	2.3302	1.5133	3.5214	2.4897	1.3435		2.1877	1.0798
H8	3.3992	2.2789	3.3898	2.8836	4.5556	1.0798	2.1877		2.6945
H9	3.3992	3.3898	2.2789	4.5556	2.8836	2.1877	1.0798	2.6945

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.583	O1	C2	C6	106.835
O1	C3	O5	122.583	O1	C3	C7	106.835
C2	O1	C3	108.004	C2	C6	C7	109.163
C2	C6	H8	122.112	C3	C7	C6	109.163
C3	C7	H9	122.112	O4	C2	C6	130.582
O5	C3	C7	130.582	C6	C7	H9	128.725
C7	C6	H8	128.725

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

using model chemistry: MP2/3-21G*

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: MP2/3-21G*

States and conformations

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