L-Alanine,3-[[2-methyl-7-[4-oxo-4-[(1,4,5,6-tetrahydro-2-pyrimidinyl)amino]butyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]amino]-N-[(phenylmethoxy)carbonyl]-,1,1-dimethylethyl ester
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