Patent ID: 8642785

Claim:
A photolabile compound depicted by the formula: wherein: R 1 is O(CH 2 ) n CO 2 H, O(CH 2 ) n OPO(OH) 2 , O(CH 2 ) n OSO 2 (OH), O(CH 2 ) n C(O)NR 3 , (CH 2 ) n CO 2 H, (CH 2 ) n OPO(OH) 2 , (CH 2 ) n OSO 2 (OH), (CH 2 ) n C(O)NR 3 , C 1-10 alkyl or substituted alkyl, O(CH 2 ) n M, N(COZ)(CH 2 ) m Y, or N[(CH 2 ) m Q][(CH 2 ) n Y], R 2 is H, (CH 2 ) n CO 2 H, (CH 2 ) n OPO(OH) 2 , (CH 2 ) n OSO 2 (OH), (CH 2 ) n C(O)NR 3 or (CH) n N(R 3 ) 2 , R 3 is H, Me or Et, n and m are independently from 1 to 10, Q and Y are independently selected from H, CO 2 H or salts thereof, or OPO 3 2− , M is selected from CO 2 H or salts thereof, or OPO 3 2− , Z is H, C 1-10 alkyl or substituted alkyl, and X is a non-carboxyl portion of a carboxylic acid.