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