Compositions comprising at least one cyclic carbonylamidine of the formula (I)in which Y, G, Z, Q, R1 and R2 are as defined in the description and at least one activity enhancer selected from the group consisting of penetrants and ammonium or phosphonium salts of the formula (II)in which D, n, R8, R9, R10, R11 and R12 are as defined in the description.