| abstract |
A compound, or a pharmaceutically acceptable salt or solvate thereof, or conjugates thereof, selected from the group consisting of: n nwherein:n (a) R 10 is H, and R 11 is OH, OR A , where R A is saturated C 1-4 alkyl; (b) R 10 and R 11 form a nitrogen-carbon double bond between the nitrogen and carbon atoms to which they are bound; or (c) R 10 is H and R 11 is SO z M, where z is 2 or 3 and M is a monovalent pharmaceutically acceptable cation, or both M together are a divalent pharmaceutically acceptable cation. |