(S)-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-L-phenylalaninyl thymidine AIDS-092508 AIDS092508 Amino acid carbamate deriv