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- noun A
triphosphate, such as ATP, in which an oxygenhas been replaced by a sulfur
from Wiktionary, Creative Commons Attribution/Share-Alike License
ITP, AMP, ADP, NAD+ and FAD can not act as cofactors, ATP and GTP can be replaced by adenosine-5'-O - (3 - thiotriphosphate), adenylylimidodiphosphate, adenylyl - (b, g-methylene) - di - phosphonate and guanylyl-imidodiphosphate )  Activating compounds ascorbate