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	hartrees
Energy at 0K	-378.538446
Energy at 298.15K	-378.541666
HF Energy	-377.312626
Nuclear repulsion energy	274.713223

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3298	3124	0.56
2	A₁	1900	1800	42.66
3	A₁	1642	1555	3.65
4	A₁	1288	1220	159.05
5	A₁	1085	1028	25.38
6	A₁	885	838	6.07
7	A₁	634	601	0.67
8	A₁	406	384	9.74
9	A₂	931	882	0.00
10	A₂	760	720	0.00
11	A₂	239	226	0.00
12	B₁	846	801	79.64
13	B₁	635	602	0.10
14	B₁	161	152	1.85
15	B₂	3277	3104	0.77
16	B₂	1847	1749	455.12
17	B₂	1341	1270	0.51
18	B₂	1077	1020	94.00
19	B₂	923	874	152.25
20	B₂	705	668	38.48
21	B₂	560	530	6.48

Atom	y (Å)	z (Å)
O1	0.000	0.972
C2	1.128	0.160
C3	-1.128	0.160
O4	2.241	0.598
O5	-2.241	0.598
C6	0.670	-1.258
C7	-0.670	-1.258
H8	1.362	-2.089
H9	-1.362	-2.089

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3898	1.3898	2.2718	2.2718	2.3279	2.3279	3.3505	3.3505
C2	1.3898		2.2564	1.1960	3.3976	1.4902	2.2897	2.2617	3.3557
C3	1.3898	2.2564		3.3976	1.1960	2.2897	1.4902	3.3557	2.2617
O4	2.2718	1.1960	3.3976		4.4819	2.4320	3.4522	2.8281	4.4949
O5	2.2718	3.3976	1.1960	4.4819		3.4522	2.4320	4.4949	2.8281
C6	2.3279	1.4902	2.2897	2.4320	3.4522		1.3394	1.0820	2.1951
C7	2.3279	2.2897	1.4902	3.4522	2.4320	1.3394		2.1951	1.0820
H8	3.3505	2.2617	3.3557	2.8281	4.4949	1.0820	2.1951		2.7234
H9	3.3505	3.3557	2.2617	4.4949	2.8281	2.1951	1.0820	2.7234

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.768	O1	C2	C6	107.810
O1	C3	O5	122.768	O1	C3	C7	107.810
C2	O1	C3	108.537	C2	C6	C7	107.921
C2	C6	H8	122.318	C3	C7	C6	107.921
C3	C7	H9	122.318	O4	C2	C6	129.421
O5	C3	C7	129.421	C6	C7	H9	129.761
C7	C6	H8	129.761

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

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

States and conformations

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