Patent ID: 7692022

Claim:
A compound selected from the group consisting of 4,5-dihydro-2-(6-(2-chloroethoxy)-benzothiazolyl)-4-thiazolecarboxylic acid (luciferin 6′ 2-chloroethyl ether); 4,5-dihydro-2-(6-(benzyloxy)-benzothiazolyl)-4-thiazolecarboxylic acid (luciferin 6′ benzyl ether); 4,5-dihydro-2-(6-(4-picolinyloxy)-benzothiazolyl-4-thiazolecarboxylic acid (luciferin 6′ 4-picolinyl ether); 4,5-dihydro-2-(6-(4-trifluoromethylbenzyloxy)-benzothiazolyl)-4-thiazolecarboxylic acid (luciferin 6′ 4-trifluoromethylbenzyl ether); 4,5-dihydro-2-(6-(phenylethoxy)-benzothiazolyl)-4-thiazolecarboxylic acid (luciferin 6′ phenylethyl ether); 4,5-dihydro-2-(6-(geranyloxy)-benzothiazolyl)-4-thiazolecarboxylic acid (luciferin 6′ geranyl ether); 4,5-dihydro-2-(6-(prenyloxy)-benzothiazolyl)-4-thiazolecarboxylic acid (luciferin 6′ prenyl ether); 4,5-dihydro-2-(6-(2-picolinyloxy)-benzothiazolyl)-4-thiazolecarboxylic acid (luciferin 6′ 2-picolinyl ether); and 4,5-dihydro-2-(6-(3-picolinyloxy)-benzothiazolyl)-4-thiazolecarboxylic acid (luciferin 6′ 3-picolinyl ether).