Disclosed are compounds capable of facilitating transport of biologically active agents or substances into cells having the general structure: ##STR00001## wherein Q is selected from the group consisting of N, O and S; L is any bivalent organic radical capable of linking each Q, such as C, CH, (CH.sub.2)l, or {(CH.sub.2)i-Y--(CH.sub.2)j}k, wherein Y is selected from the group consisting of CH.sub.2, an ether, a polyether, an amide, a polyamide, an ester, a sulfide, a urea, a thiourea, a guanidyl, a carbamoyl, a carbonate, a phosphate, a sulfate, a sulfoxide, an imine, a carbonyl, and a secondary amino group and wherein Y is optionally substituted by --X.sub.1--L'--X.sub.2--Z or --Z; R.sub.1 R.sub.6, independently of one another, are selected from the group consisting of H, --(CH.sub.2)p-D--Z, an alkyl, an alkenyl, an aryl, and an alkyl or alkyl ether optionally substituted by one or more of an alcohol, an aminoalcohol, an amine, an amide, an ether, a polyether, a polyamide, an ester, a mercaptan, an alkylthio, a urea, a thiourea, a guanidyl, or a carbamoyl group, and wherein at least one of R.sub.1, R.sub.3, R.sub.4 and R.sub.6 is a straight chain or branched, cyclic, alkyl, alkenyl, alkynyl or aryl group; and anyone of R.sub.1, R.sub.3, R.sub.4 and/or R.sub.6 may optionally be covalently linked with each other, with Y or with L when L is C or CH to form a cyclic moiety; Z is selected from the group consisting of amine, spermiyl, carboxyspermiyl, guanidyl, spermidinyl, putricinyl, diaminoalkyl, pyridyl, piperidinyl, pyrrolidinyl, polyamine, amino acid, peptide, and protein; X.sub.1 and X.sub.2, independently of one another, are selected from the group consisting of NH, O, S, alkylene, and arylene; L' is selected from the group consisting of alkylene, alkenylene, alkynylene, arylene, alkylene ether, and polyether; D is Q or a bond; A.sub.1 and A.sub.2, independently of one another, are selected from the group consisting of CH.sub.2O, CH.sub.2S, CH.sub.2NH, C(O), C{NH), C(S) and (CH.sub.2)t; X is a physiologically acceptable anion; m, n, r, s, u, v, w and y are 0 or 1, with the proviso that when both m and n are 0 at least one of r, s, u and y is other than 0; i, j, k, l, p and are integers from 0 to about 100; q is an integer from 1 to about 1000; and a is the number of positive charge divided by the valence of the anion.