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	hartrees
Energy at 0K	-378.552672
Energy at 298.15K	-378.555910
HF Energy	-377.316501
Nuclear repulsion energy	274.724337

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3304	3134	0.78
2	A₁	1901	1803	42.29
3	A₁	1639	1554	3.26
4	A₁	1287	1221	163.12
5	A₁	1076	1021	21.94
6	A₁	884	839	5.75
7	A₁	634	601	0.59
8	A₁	405	385	9.65
9	A₂	948	899	0.00
10	A₂	757	718	0.00
11	A₂	238	226	0.00
12	B₁	849	806	72.16
13	B₁	638	605	0.01
14	B₁	160	152	1.93
15	B₂	3282	3113	1.06
16	B₂	1847	1752	451.29
17	B₂	1336	1267	0.20
18	B₂	1072	1017	94.77
19	B₂	923	876	151.44
20	B₂	705	668	37.90
21	B₂	560	531	6.66

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	1.363	-2.088
H9	-1.363	-2.088

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3897	1.3897	2.2720	2.2720	2.3279	2.3279	3.3492	3.3492
C2	1.3897		2.2565	1.1958	3.3976	1.4906	2.2899	2.2604	3.3554
C3	1.3897	2.2565		3.3976	1.1958	2.2899	1.4906	3.3554	2.2604
O4	2.2720	1.1958	3.3976		4.4822	2.4319	3.4520	2.8258	4.4945
O5	2.2720	3.3976	1.1958	4.4822		3.4520	2.4319	4.4945	2.8258
C6	2.3279	1.4906	2.2899	2.4319	3.4520		1.3392	1.0812	2.1952
C7	2.3279	2.2899	1.4906	3.4520	2.4319	1.3392		2.1952	1.0812
H8	3.3492	2.2604	3.3554	2.8258	4.4945	1.0812	2.1952		2.7252
H9	3.3492	3.3554	2.2604	4.4945	2.8258	2.1952	1.0812	2.7252

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.813	O1	C2	C6	107.799
O1	C3	O5	122.813	O1	C3	C7	107.799
C2	O1	C3	108.562	C2	C6	C7	107.920
C2	C6	H8	122.217	C3	C7	C6	107.920
C3	C7	H9	122.217	O4	C2	C6	129.388
O5	C3	C7	129.388	C6	C7	H9	129.863
C7	C6	H8	129.863

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)