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	hartrees
Energy at 0K	-378.765974
Energy at 298.15K	-378.759784
HF Energy	-377.230166
Nuclear repulsion energy	278.616438

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3467	3267	0.93
2	A₁	2154	2029	107.42
3	A₁	1823	1717	1.18
4	A₁	1433	1350	232.77
5	A₁	1180	1112	14.76
6	A₁	956	901	6.13
7	A₁	697	656	0.33
8	A₁	444	419	20.00
9	A₂	1097	1034	0.00
10	A₂	843	794	0.00
11	A₂	285	269	0.00
12	B₁	957	902	117.69
13	B₁	713	671	3.65
14	B₁	176	166	4.78
15	B₂	3446	3247	0.59
16	B₂	2074	1954	964.32
17	B₂	1468	1383	0.36
18	B₂	1216	1145	123.21
19	B₂	1057	996	83.28
20	B₂	776	731	19.80
21	B₂	608	573	1.40

Atom	y (Å)	z (Å)
O1	0.000	0.975
C2	1.132	0.156
C3	-1.132	0.156
O4	2.254	0.598
O5	-2.254	0.598
C6	0.669	-1.256
C7	-0.669	-1.256
H8	1.359	-2.090
H9	-1.359	-2.090

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3969	1.3969	2.2850	2.2850	2.3286	2.3286	3.3524	3.3524
C2	1.3969		2.2643	1.2055	3.4146	1.4861	2.2889	2.2579	3.3542
C3	1.3969	2.2643		3.4146	1.2055	2.2889	1.4861	3.3542	2.2579
O4	2.2850	1.2055	3.4146		4.5075	2.4389	3.4614	2.8335	4.5030
O5	2.2850	3.4146	1.2055	4.5075		3.4614	2.4389	4.5030	2.8335
C6	2.3286	1.4861	2.2889	2.4389	3.4614		1.3385	1.0823	2.1928
C7	2.3286	2.2889	1.4861	3.4614	2.4389	1.3385		2.1928	1.0823
H8	3.3524	2.2579	3.3542	2.8335	4.5030	1.0823	2.1928		2.7173
H9	3.3524	3.3542	2.2579	4.5030	2.8335	2.1928	1.0823	2.7173

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	123.345	O1	C2	C6	107.215
O1	C3	O5	123.345	O1	C3	C7	107.215
C2	O1	C3	109.988	C2	C6	C7	107.790
C2	C6	H8	122.177	C3	C7	C6	107.790
C3	C7	H9	122.177	O4	C2	C6	129.440
O5	C3	C7	129.440	C6	C7	H9	130.033
C7	C6	H8	130.033

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

using model chemistry: G2

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: G2

States and conformations

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