Patent ID: 8318705

Claim:
A compound of formula I or a pharmaceutically acceptable salt or solvate thereof, wherein: each R 1 and R 2 is independently a substituted or unsubstituted C 1 -C 8 alkyl, substituted or unsubstituted C 2 -C 8 alkenyl, substituted or unsubstituted C 2 -C 8 alkynyl, or R 1 and R 2 are taken together to form an unsubstituted or substituted 6 or 7-membered carbocyclic moiety or an unsubstituted or substituted 5, 6 or 7-membered heterocyclic moiety; D is P(O)(OC 1 -C 8 alkyl) 2 ; provided that (i) when R 1 or R 2 is an unsubstituted C 1 -C 8 alkyl, the R 1 or R 2 that is an unsubstituted C 1 -C 8 alkyl is other than methyl or propyl; (ii) when R 1 and R 2 are taken together to form a substituted 6-membered carbocyclic moiety, the substituted 6-membered carbocyclic moiety is a monocyclic or bicyclic ring that is substituted with a moiety other than alkyl, nitroso, acyl, oxime, and substituted alkenyl; (iii) when R 1 and R 2 are taken together to form an unsubstituted or substituted 5 or 6-membered heterocyclic moiety, the 5 or 6-membered heterocyclic moiety is a monocyclic or bicyclic ring other than dioxane or acyloxy-substituted tetrahydropyan; or (iv) when each R 1 and R 2 is a substituted C 1 -C 8 alkyl, each R 1 and R 2 is other than trifluoromethyl.