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	hartrees
Energy at 0K	-378.574131
Energy at 298.15K	-378.576938
HF Energy	-377.347407
Nuclear repulsion energy	274.837775

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3313	3156	1.10
2	A₁	1883	1794	38.55
3	A₁	1643	1565	2.98
4	A₁	1274	1214	154.23
5	A₁	1090	1038	25.71
6	A₁	878	836	5.57
7	A₁	637	607	0.88
8	A₁	406	387	8.78
9	A₂	849	808	0.00
10	A₂	666	635	0.00
11	A₂	46	44	0.00
12	B₁	797	759	71.17
13	B₁	608	579	0.01
14	B₁	147	140	2.09
15	B₂	3292	3136	1.52
16	B₂	1827	1741	500.92
17	B₂	1349	1285	0.78
18	B₂	1073	1022	90.17
19	B₂	911	868	183.30
20	B₂	703	669	47.07
21	B₂	565	538	8.77

Atom	y (Å)	z (Å)
O1	0.000	0.973
C2	1.129	0.157
C3	-1.129	0.157
O4	2.242	0.598
O5	-2.242	0.598
C6	0.667	-1.256
C7	-0.667	-1.256
H8	1.357	-2.084
H9	-1.357	-2.084

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3926	1.3926	2.2728	2.2728	2.3264	2.3264	3.3445	3.3445
C2	1.3926		2.2575	1.1966	3.3989	1.4866	2.2852	2.2529	3.3467
C3	1.3926	2.2575		3.3989	1.1966	2.2852	1.4866	3.3467	2.2529
O4	2.2728	1.1966	3.3989		4.4831	2.4317	3.4488	2.8237	4.4873
O5	2.2728	3.3989	1.1966	4.4831		3.4488	2.4317	4.4873	2.8237
C6	2.3264	1.4866	2.2852	2.4317	3.4488		1.3342	1.0777	2.1866
C7	2.3264	2.2852	1.4866	3.4488	2.4317	1.3342		2.1866	1.0777
H8	3.3445	2.2529	3.3467	2.8237	4.4873	1.0777	2.1866		2.7130
H9	3.3445	3.3467	2.2529	4.4873	2.8237	2.1866	1.0777	2.7130

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.571	O1	C2	C6	107.759
O1	C3	O5	122.571	O1	C3	C7	107.759
C2	O1	C3	108.295	C2	C6	C7	108.093
C2	C6	H8	122.136	C3	C7	C6	108.093
C3	C7	H9	122.136	O4	C2	C6	129.670
O5	C3	C7	129.670	C6	C7	H9	129.771
C7	C6	H8	129.771

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

using model chemistry: MP2=FULL/TZVP

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/TZVP

States and conformations

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