Ethyl 4-hydroxy-2-(methylsulfanyl)-5-pyrimidinecarboxylate53554-29-331 % similar 4-Chloro-1H-pyrrolo[2,3-B]pyridine-5-carbaldehyde958230-19-830 % similar Ethyl 4-amino-2-(ethylthio)-5-pyrimidinecarboxylate778-97-230 % similar