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	hartrees
Energy at 0K	-378.784577
Energy at 298.15K	-378.778498
HF Energy	-377.228304
Nuclear repulsion energy	278.919508

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3451	3451	0.83
2	A₁	2153	2153	115.95
3	A₁	1821	1821	1.25
4	A₁	1434	1434	242.84
5	A₁	1169	1169	13.73
6	A₁	957	957	5.97
7	A₁	696	696	0.65
8	A₁	448	448	19.31
9	A₂	1093	1093	0.00
10	A₂	859	859	0.00
11	A₂	286	286	0.00
12	B₁	961	961	111.10
13	B₁	717	717	3.01
14	B₁	176	176	4.46
15	B₂	3428	3428	0.46
16	B₂	2073	2073	1019.13
17	B₂	1456	1456	0.26
18	B₂	1208	1208	125.90
19	B₂	1057	1057	82.51
20	B₂	775	775	21.17
21	B₂	610	610	1.41

Atom	y (Å)	z (Å)
O1	0.000	0.947
C2	1.113	0.168
C3	-1.113	0.168
O4	2.198	0.600
O5	-2.198	0.600
C6	0.660	-1.254
C7	-0.660	-1.254
H8	1.352	-2.074
H9	-1.352	-2.074

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3580	1.3580	2.2254	2.2254	2.2970	2.2970	3.3092	3.3092
C2	1.3580		2.2256	1.1680	3.3390	1.4925	2.2723	2.2550	3.3319
C3	1.3580	2.2256		3.3390	1.1680	2.2723	1.4925	3.3319	2.2550
O4	2.2254	1.1680	3.3390		4.3964	2.4088	3.4061	2.8044	4.4441
O5	2.2254	3.3390	1.1680	4.3964		3.4061	2.4088	4.4441	2.8044
C6	2.2970	1.4925	2.2723	2.4088	3.4061		1.3191	1.0733	2.1721
C7	2.2970	2.2723	1.4925	3.4061	2.4088	1.3191		2.1721	1.0733
H8	3.3092	2.2550	3.3319	2.8044	4.4441	1.0733	2.1721		2.7035
H9	3.3092	3.3319	2.2550	4.4441	2.8044	2.1721	1.0733	2.7035

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	123.357	O1	C2	C6	107.289
O1	C3	O5	123.357	O1	C3	C7	107.289
C2	O1	C3	110.061	C2	C6	C7	107.680
C2	C6	H8	122.159	C3	C7	C6	107.680
C3	C7	H9	122.159	O4	C2	C6	129.354
O5	C3	C7	129.354	C6	C7	H9	130.161
C7	C6	H8	130.161

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

using model chemistry: CBS-Q

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: CBS-Q

States and conformations

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