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	hartrees
Energy at 0K	-377.795210
Energy at 298.15K	-377.798157
HF Energy	-377.073697
Nuclear repulsion energy	265.300052

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3284	3170	0.30
2	A₁	1712	1653	27.40
3	A₁	1575	1520	1.57
4	A₁	1181	1140	52.00
5	A₁	1052	1015	98.61
6	A₁	798	770	15.90
7	A₁	588	568	2.03
8	A₁	365	352	7.44
9	A₂	898	867	0.00
10	A₂	720	695	0.00
11	A₂	264	255	0.00
12	B₁	821	793	92.71
13	B₁	584	564	0.45
14	B₁	158	152	1.11
15	B₂	3250	3137	0.21
16	B₂	1655	1598	351.11
17	B₂	1330	1284	1.19
18	B₂	1019	983	60.70
19	B₂	768	742	146.53
20	B₂	662	639	142.72
21	B₂	512	495	39.59

Atom	y (Å)	z (Å)
O1	0.000	1.017
C2	1.185	0.152
C3	-1.185	0.152
O4	2.340	0.604
O5	-2.340	0.604
C6	0.684	-1.281
C7	-0.684	-1.281
H8	1.369	-2.127
H9	-1.369	-2.127

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4668	1.4668	2.3764	2.3764	2.3970	2.3970	3.4281	3.4281
C2	1.4668		2.3696	1.2409	3.5541	1.5176	2.3549	2.2858	3.4222
C3	1.4668	2.3696		3.5541	1.2409	2.3549	1.5176	3.4222	2.2858
O4	2.3764	1.2409	3.5541		4.6807	2.5092	3.5638	2.8985	4.6058
O5	2.3764	3.5541	1.2409	4.6807		3.5638	2.5092	4.6058	2.8985
C6	2.3970	1.5176	2.3549	2.5092	3.5638		1.3683	1.0880	2.2202
C7	2.3970	2.3549	1.5176	3.5638	2.5092	1.3683		2.2202	1.0880
H8	3.4281	2.2858	3.4222	2.8985	4.6058	1.0880	2.2202		2.7373
H9	3.4281	3.4222	2.2858	4.6058	2.8985	2.2202	1.0880	2.7373

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.498	O1	C2	C6	106.858
O1	C3	O5	122.498	O1	C3	C7	106.858
C2	O1	C3	107.756	C2	C6	C7	109.264
C2	C6	H8	121.751	C3	C7	C6	109.264
C3	C7	H9	121.751	O4	C2	C6	130.644
O5	C3	C7	130.644	C6	C7	H9	128.986
C7	C6	H8	128.986

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

using model chemistry: MP2/SDD

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/SDD

States and conformations

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