The present invention provides a pharmaceutical composition comprising a pharmaceutically acceptable excipient and a compound of the formula:
wherein R1, R2, R3, R5, R6 and R8 are each independently a member selected from the group consisting of H, C1-6 alkyl and OH; R4, R7 and R9 are each independently selected from the group consisting of C1-6 alkoxy and OH; R10 is a member selected from the group consisting of H, —OH, —OP(O)Me2,
—O—(CH2)n—OH and —O—(CH2)m—O—(CH2)o— CH3, wherein subscripts n and m are each independently from 2 to 8 and subscript o is from 1 to 6; each of L1 and L4 are independently selected from the group consisting of:
each of L2 and L3 are independently selected from the group consisting of:
salts, hydrates, isomers, metabolites and prodrugs thereof.