Table 5. Mean Unsigned Errors for Compound Classes (kcal/mol).

	1.14*CM1A	1.27*CM5
all molecules (42)	1.17	1.10
non-aromatic (22)	1.34	1.08
aromatic (20)	0.99	1.12
C, H containing (6)	0.79	1.26
halogen containing (5)	0.70	1.51
C, H, O containing (11)	0.91	0.49
alcohols/ethers (4)	1.09	0.83
carbonyls (7)	0.81	0.29
C, H, N containing (8)	1.37	0.95
amines (6)	1.48	0.93
nitriles (2)	1.05	1.00
C, H, N, O containing (7)	1.70	0.93
amides (5)	1.05	1.11
nitros (2)	3.31	0.48
sulfur containing (5)	1.63	2.31
thiols/sulfides (4)	1.35	1.98
sulfoxide (1)	2.77	3.63