Patent ID: 8846721

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt, ester prodrug or stereoisomer thereof, wherein, X is NH; L is a substituted or unsubstituted C1-4 alkylene, wherein the substituents are selected from Ra; X and L together with their attached positions form a five membered heterocyclyl, wherein heterocyclyl is Y is a bond, —C(O)—, or —S(O) 2 —; R 1 is selected from H or C1-C3 alkyl; R 2 , is selected from H or C2-C3 alkenyl; R 3 is H; Ra is selcted from H, OR′, C(O)2R′, C(O)R′, NR′, N(NH)NR′, SR′, SO2R′, SO2NR′, NSO2R′, C(O)NR′, (CH2)nOR′, (CH2)nSR′, substituted or unsubstituted C1-C6 alkyl, wherein the substituent is selected from OMe, S-Me,isopropyl, isobutyl —(CH2)n-Ph, —(CH2)n-Ph—OMe or —(CH2)n-indole, n is an integer 0-5; and R′ is selected from H, C1-C5 alkyl, —(CH2)n-Ph, —(CH2)n-Ph—OMe or —(CH2)n-indole;