is oh formula iv or v preferably d is a further aspect of the invention provides the conjugates of the invention optionally prepared with a diagnostic tag linked to the transport enhancer described above wherein the tag is selected for diagnostic or imaging purposes thus a suitable tag is prepared by linking any suitable moiety e g an amino acid residue to any art standard emitting isotope radio opaque label magnetic resonance label or other non radioactive isotopic labels suitable for magnetic resonance imaging fluorescence type labels labels exhibiting visible colors and or capable of fluorescing under ultraviolet infrared or electrochemical stimulation to allow for imaging tumor tissue during surgical procedures and so forth optionally the diagnostic tag is incorporated into and or linked to a conjugated therapeutic moiety allowing for monitoring of the distribution of a therapeutic biologically active material within an animal or human patient in a still further aspect of the invention the inventive tagged conjugates are readily prepared by art known methods with any suitable label including e g radioisotope labels simply by way of example these include 131 iodine 125 iodine 99m technetium and or 111 indium to produce radioimmunoscintigraphic agents for selective uptake into tumor cells in vivo for instance there are a number of art known methods of linking peptide to tc 99m including simply by way of example those shown by u s pat nos 5 328 679 5 888 474 5 997 844 and 5 997 845 incorporated by reference herein broadly for anatomical localization of tumor tissue in a patient the conjugate tag is administered to a patient or animal suspected of having a tumor after sufficient time to allow the.