1-(9'-(o-carboxyphenyl)-6'-amino-2'-chloro-3'-xanthanone)-4,10-(diethyl)-7-(2-pyridylmethyl)-1,4,7,10-tetraazacyclododecane
1-(9'-(o-carboxyphenyl)-6'-amino-2'-chloro-3'-xanthanone)-4,10-(diethyl)-7-(2-pyridylmethyl)-1,4,7,10-tetraazacyclododecane