(R)-2-[3-Azido-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-ylmethoxycarbonylamino]-3-phenyl-propionic acid methyl ester 3'-Azido-2',3'-didehydro-5'-O-methoxy-D-phenylalaninyl thymidine AIDS-092512 AIDS092512 Amino acid carbamate deriv