Patent ID: 8703813

Claim:
A compound of Formula I below, a stereoisomer thereof, an enantiomer thereof, an in vivo-hydrolysable precursor thereof, or a pharmaceutically acceptable salt thereof: wherein: W is CO or CHOR 1 ; X is N 3 , NHR 2 , OR 2 , SR 2 , SeR 2 or TeR 2 ; R 1 and R 2 are, independently, selected from hydrogen, straight or branched C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, C3-C8 cycloalkyl, C6-C 20 aryl, C4-C 20 heteroaryl or Y is O, S or NR 4 ; Z is a single bond, NH, O, S, Se or Te; R 3 and R 4 each are independently selected from hydrogen, straight or branched C1-C8 alkyl, C2-C8 alkenyl, C2-C8 alkynyl, C3-C8 cycloalkyl, C6-C 20 aryl, or C4-C 20 heteroaryl; and M and N each are independently hydrogen, OH, or do not exist; wherein a carbon atom bonded to M or N forms a single bond or a double bond with other carbon atoms and the number of double bonds is one or less for each of the carbon atoms.