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	hartrees
Energy at 0K	-378.284336
Energy at 298.15K
HF Energy	-377.227945
Nuclear repulsion energy	273.985458

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3342	3146	0.29
2	A₁	1953	1838	56.75
3	A₁	1692	1593	1.43
4	A₁	1312	1235	158.51
5	A₁	1106	1041	17.77
6	A₁	888	836	6.40
7	A₁	640	603	0.23
8	A₁	403	380	12.37
9	A₂	945	890	0.00
10	A₂	734	691	0.00
11	A₂	244	230	0.00
12	B₁	842	793	79.87
13	B₁	634	597	1.36
14	B₁	161	151	2.82
15	B₂	3321	3126	0.43
16	B₂	1885	1774	552.16
17	B₂	1372	1292	0.03
18	B₂	1112	1047	108.88
19	B₂	940	885	127.79
20	B₂	717	675	27.69
21	B₂	562	529	3.82

Atom	y (Å)	z (Å)
O1	0.000	0.972
C2	1.133	0.160
C3	-1.133	0.160
O4	2.249	0.601
O5	-2.249	0.601
C6	0.669	-1.261
C7	-0.669	-1.261
H8	1.358	-2.090
H9	-1.358	-2.090

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3938	1.3938	2.2797	2.2797	2.3307	2.3307	3.3492	3.3492
C2	1.3938		2.2656	1.2009	3.4110	1.4945	2.2943	2.2608	3.3561
C3	1.3938	2.2656		3.4110	1.2009	2.2943	1.4945	3.3561	2.2608
O4	2.2797	1.2009	3.4110		4.4989	2.4429	3.4619	2.8353	4.5006
O5	2.2797	3.4110	1.2009	4.4989		3.4619	2.4429	4.5006	2.8353
C6	2.3307	1.4945	2.2943	2.4429	3.4619		1.3374	1.0779	2.1894
C7	2.3307	2.2943	1.4945	3.4619	2.4429	1.3374		2.1894	1.0779
H8	3.3492	2.2608	3.3561	2.8353	4.5006	1.0779	2.1894		2.7153
H9	3.3492	3.3561	2.2608	4.5006	2.8353	2.1894	1.0779	2.7153

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.774	O1	C2	C6	107.546
O1	C3	O5	122.774	O1	C3	C7	107.546
C2	O1	C3	108.726	C2	C6	C7	108.091
C2	C6	H8	122.178	C3	C7	C6	108.091
C3	C7	H9	122.178	O4	C2	C6	129.680
O5	C3	C7	129.680	C6	C7	H9	129.731
C7	C6	H8	129.731

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

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

States and conformations

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