Carbamic acid,[1-[7-(2-butynyl)-1-[(3,4-dihydro-3-methyl-4-oxo-2-quinazolinyl)methyl]-2,3,6,7-tetrahydro-3-methyl-2,6-dioxo-1H-purin-8-yl]-3-piperidinyl]-,1,1-dimethylethyl ester
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