Patent ID: 7223837

Claim:
A compound of the formula: V—(W) k —(X) l —A—Z wherein: V is an enzymatically removable specifier, optionally being removable after prior binding to a receptor; (W) k —(X) l —A is an elongated self-eliminating spacer system; W and X are each a 1,(4+2n) electronic cascade self-eliminating spacer, being the same or different; A is either a spacer group of formula (Y) m , wherein Y is a 1,(4+2n) electronic cascade self-eliminating spacer, or a group of formula U being a cyclisation self-elimination spacer; Z is a therapeutic or diagnostic moiety; k and l are independently an integer from 0 (included) to 5 (included); m is an integer from 1 (included) to 5 (included); n is an integer from 0 (included) to 10 (included), and k+1>0.