Patent ID: 7850008

Claim:
A method for the diagnosis of disorders or abnormalities of an internal surface of the body, comprising: (i) administering to the sites of investigation or affected surfaces a composition comprising a compound of formula (I) R 2 2 N—CH 2 COCH 2 —CH 2 CO—OR 1 (I) wherein, R 1 is alkyl; and each R 2 is independently hydrogen or alkyl; wherein each alkyl of R 1 and R 2 is optionally substituted by hydroxy, alkoxy, acyloxy, alkoxycarbonyloxy, amino, aryl, oxo or fluoro groups and is optionally interrupted by oxygen atoms; or a pharmaceutically acceptable salt thereof; and (ii) exposing said sites or surfaces to light, wherein the internal surface of the body is the lining of the intestine.