Ethyl 10-thia-5-deazapteroate

ethyl 4-[(2-amino-6-ethyl-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)sulfanyl]benzoate

diethyl N-[4-[(2-amino-6-ethyl-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)thio]benzoyl]-L-glutamate

ethyl 4-[(2,4-diamino-5-isopropyl-7H-pyrrolo[2,3-d]pyrimidin-6-yl)sulfanyl]-benzoate

ethyl 4-[(2,4-diamino-5-propyl-7H-pyrrolo[2,3-d]pyrimidin-6-yl)sulfanyl]benzoate