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The chemical structures and atomic numbering of the four ligands. (a) Cyromazine, N-cyclopropyl-1,3,5-triazine-2,4,6-triamine. (b) Trimetrexate, 5-methyl-6-[(3,4,5-trimethoxyphenyl)aminomethyl]quinazoline-2,4-diamine. (c) Pemetrexed, 2-{4-[2-(4-amino-2-oxo-3,5,7-triazabicyclo[4.3.0]nona-3,8,10-trien-9-yl)ethyl]benzoyl}aminopentanedioic acid. (d) PY848, 2,4-diamino-5-[2-(2,5-dimethoxyphenyl)ethyl]thieno[2,3-d]-pyrimidine.
