Abstract: Macrocyclic compounds having 1, 4, 8, 11-tetraazacyclotetradecanyl group, show good selectivity against HIV-1 and HIV-2, in in vitro tests are disclosed.

Abstract: Linked polyamine cyclic compounds of general formula V--R--A--R'--W where V and W are independently cyclic polyamine moieties having from 9 to 32 ring members and 3 to 8 amine nitrogens and having either one or more aromatic rings fused thereto or a heteroatom other than nitrogen incorporated in the ring, A is an aliphatic or aromatic moiety and R and R' are each a linking chain, possess improved partition coefficients at biologically relevant pH compared to known compounds, and possess high anti-HIV activity.

Abstract: A compound of formula I ##STR1## in which E is an alkenyl group or represents H.sub.2 in which case the compound is in acid addition salt form, J is selected from --CO--NH--, --CO--O--, --CO--S-- and --NH--CO--, T is an alkylene chain, or, if J is --CO--NH--, T is the residue of an amino acid moiety, Q is a hydrophilic or cleavable moiety, and Z is an amine- and/or thiol-reactive moiety. Conjugates formed by reacting such compound with a macromolecule, e.g. an immunoglobulin, and labelled macromolecules comprising a metal atom bound to such conjugate are also disclosed.