alpha-ketoglutarate
2 COO-, =O on C4
Pyruvate
3C
Citrate
6C, 3COO-, OH on C3
Oxaloacetate
4C, 2COO-, C2=O,
Succinate
4C, 2COO-, 2CH2
Isocitrate
6C, 3COO-, OH on C4
L-Malate
4C, 2COO-, C2 is HOCH
Fumarate
4C, 2COO-, C(2)H=C(3)H
Succinyl CoA
COO-, CH2, CH2, C=O, S-CoA