The invention provides a compound of formula (I): wherein: R1 is an optionally substituted 2-(1-azathiaxanthone); each -R2 is independently of the formula -CH2-C(=O)-R4, wherein R4 is an amino acid or a salt thereof, attached to the remainder of R2 through the nitrogen atom of the amino group; and R3 is hydrogen or a C1-6 alkyl group); or (wherein: R1 is an optionally substituted 2-(1-azaxanthone); each R2 is independently an optionally substituted glutaric or succinic acid, or a salt or ester thereof; and R3 is hydrogen or a C1-6 alkyl group).
本发明提供了一个化合物,其
化学式为(I):其中:R1是可选取代的2-(1-
氮杂
黄酮);每个-R2独立地是公式-
CH2-C(=O)-R4,其中R4是
氨基酸或其盐,通过
氨基团的
氮原子连接到R2的其余部分;而R3是
氢或C1-6烷基);或(其中:R1是可选取代的2-(1-
氮杂黄色素);每个R2独立地是可选取代的
戊二酸或
琥珀酸,或其盐或
酯;而R3是
氢或C1-6烷基)。