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O,O'-Bis(trimethylsilyl)-5-fluorouracil17242-85-2100 % similar N-(Trimethylsilyl)-2-[(trimethylsilyl)oxy]-4-pyrimidinamine18037-10-038 % similar 5-Fluoro-2-methoxy-4(3H)-pyrimidinone1480-96-238 % similar 2-Ethoxy-5-fluorouracil56177-80-136 % similar