Patent ID: 8835641

Claim:
A fluorescent marker of Formula I: wherein: i) X and Y are ii) R and R 1 are independently selected from H and alkyl; iii) Ar is phenyl or pyridyl; iv) L is a spacer selected from the group consisting of —NH—; —(CH 2 ) n NH—; —NHSO 2 —; —(CH 2 ) n NHCO—; -(cycloalkyl)NHCO—; —(CH 2 ) n NHSO 2 —; -(cycloalkyl)NHSO 2 —; —CONH(CH 2 ) n NHCO—; —CONH(cycloalkyl)NHCO—; —NHCO(CH 2 ) n NHCO—; —NHCO(cycloalkyl)NHCO—; —(CH 2 ) n SO 2 NH—; -(cycloalkyl)SO 2 NH—; —(CH 2 ) n NHCSNH—; -(cycloalkyl)NHCSNH—; —CR═CR 1 —; —C≡C—; —(CH 2 ) n N═CH—; -(cycloalkyl)N═CH—; —N═CH(CH 2 )—; —N═CH(cycloalkyl)-; v) n is an integer ranging from 1 to 5; vi) F is a fluorophore selected from the group consisting of fluorescein, rhodamine, eosin, thionine, safranin, coumarin, methoxycoumarin, dansyl, BODIPY and BODIPY derivatives; and wherein X, Y and L may be independently positioned in a 1,3,5; 1,2,3; 1,3,4 or in a 3,4,5 configuration.