Patent ID: 8361734

Claim:
A method for determining the amount of a compound of formula I present in a human body fluid: wherein R 1 , R 2 , R 3 , R 5 , R 6 and R 7 are independently X 3 R where R is selected from the group consisting of H, halo; optionally substituted saccharide, aliphatic, cycloalkyl, aryl and heteroaryl; —P(O)(OR a )(OR b ) and —NR a R b , where R a and R b are independently H, optionally substituted aliphatic, cycloalkyl, aryl or heteroaryl; X 1 and X 3 are independently —C(O)O—, —OC(O)—, —C(O)NH—, —NHC(O)—, —OC(O)NH—, —NHC(O)O—, —OS(O) y —, —S(O) y —, —O—, —NHC(O)—, —NHC(O)O—, —S(O) 2 NH—, a bond or absent; where y is an integer from 0 to 3; R 4 is H, (═O); hydroxy; or optionally substituted saccharide, aliphatic, cycloalkyl, aryl or heteroaryl; or —P(O)(OR a )(OR b ) or —NR a R b , where R a and R b are independently H, or optionally substituted aliphatic, cycloalkyl, aryl or heteroaryl; and X 2 is —O— and R 8 is optionally substituted saccharide; or X 2 is —OS(O) y — or —S(O) y —, where y is an integer from 0 to 3, and R 8 is H or optionally substituted aliphatic; the method comprising: a. obtaining a human body fluid b. measuring the amount of the compound of formula I in the human body fluid.