Patent ID: 8049008

Claim:
A compound having the following formula (I): wherein R a is indolyl substituted with one or more substituents selected from the group consisting of alkyl, acyl, oxo, aryl, arylalkyl, acyloxyalkyl, amidino, alkoxy, cyano, guanidino, alkylguanidino, dialkylguanidino, halo, hydrazinyl, hydroxyl, pyridinyl, nitro, —OC(O)—R d , —N(R d ) 2 , —C(O)OR d , —C(O)N(R d ) 2 , —N(R d )C(O)OR d , —N(R d )C(O)R d , —N(R d )S(O) t R d (where t is 1 or 2), —S(O) t OR d (where t is 1 or 2), —S(O) p R d (where p is 0, 1 or 2), and —S(O) t N(R d ) 2 (where t is 1 or 2) where each R d is independently hydrogen, alkyl, aryl, arylalkyl, heterocyclyl or heterocyclylalkyl; R b is hydrogen; R c is hydroxyl, amidosulfonate, phosphate, monosodiumphosphate, or disodiumphosphate, as an isolated stereoisomer or a mixture of stereoisomers or as a pharmaceutically acceptable salt.