A molecule having the structure of formula: - - - -; or the structure of formula: - - - -; wherein: (a) is a cell penetrating peptide arranged in the N to C terminal direction; and are spacer moieties which are independently present or absent; is a first linking moiety; is a second linking moiety; (b) each of and is independently attached to a separate cargo molecule which comprises or consists of an oligonucleotide; (c) each said oligonucleotide comprises a sequence which specifically hybridises to a target sequence and either: (i) the oligonucleotide attached to is identical to the oligonucleotide attached to; or (ii) the oligonucleotide attached to and the oligonucleotide attached to each comprise a sequence which specifically hybridises to the same target sequence; or (iii) the oligonucleotide attached to comprises a sequence which specifically hybridises to a first target sequence in an RNA molecule and the oligonucleotide attached to comprises a sequence which specifically hybridises to a second, different target sequence in the same RNA molecule; or (iv) the oligonucleotide attached to comprises a sequence which specifically hybridises to a first target sequence in an RNA molecule, the sequence of which RNA molecule is encoded by a sequence in the genome of a cell which at least partially overlaps on the same or the opposite DNA strand with a sequence in said genome which encodes a second RNA molecule, and the oligonucleotide attached to comprises a sequence which specifically hybridises to a target sequence in said second RNA molecule. (a) is a cell penetrating peptide arranged in the N to C terminal direction; and are spacer moieties which are independently present or absent; is a first linking moiety; is a second linking moiety; is a cell penetrating peptide arranged in the N to C terminal direction; and are spacer moieties which are independently present or absent; is a first linking moiety; is a second linking moiety; (b) each of and is independently attached to a separate cargo molecule which comprises or consists of an oligonucleotide; (c) each said oligonucleotide comprises a sequence which specifically hybridises to a target sequence and either: (i) the oligonucleotide attached to is identical to the oligonucleotide attached to; or (ii) the oligonucleotide attached to and the oligonucleotide attached to each comprise a sequence which specifically hybridises to the same target sequence; or (iii) the oligonucleotide attached to comprises a sequence which specifically hybridises to a first target sequence in an RNA molecule and the oligonucleotide attached to comprises a sequence which specifically hybridises to a second, different target sequence in the same RNA molecule; or (iv) the oligonucleotide attached to comprises a sequence which specifically hybridises to a first target sequence in an RNA molecule, the sequence of which RNA molecule is encoded by a sequence in the genome of a cell which at least partially overlaps on the same or the opposite DNA strand with a sequence in said genome which encodes a second RNA molecule, and the oligonucleotide attached to comprises a sequence which specifically hybridises to a target sequence in said second RNA molecule. (i) the oligonucleotide attached to is identical to the oligonucleotide attached to; or (ii) the oligonucleotide attached to and the oligonucleotide attached to each comprise a sequence which specifically hybridises to the same target sequence; or (iii) the oligonucleotide attached to comprises a sequence which specifically hybridises to a first target sequence in an RNA molecule and the oligonucleotide attached to comprises a sequence which specifically hybridises to a second, different target sequence in the same RNA molecule; or (iv) the oligonucleotide attached to comprises a sequence which specifically hybridises to a first target sequence in an RNA molecule, the sequence of which RNA molecule is encoded by a sequence in the genome of a cell which at least partially overlaps on the same or the opposite DNA strand with a sequence in said genome which encodes a second RNA molecule, and the oligonucleotide attached to comprises a sequence which specifically hybridises to a target sequence in said second RNA molecule.