The action of rotameric probes introduced either in position 7 or 8 in the sequence of substance P (SP) was investigated, ie l-tetrahydroisoquinoleic acid (Tic), l-fluorenylglycine (Flg), l-diphenylalanine (Dip), the diastereoisomers of l-1-indanylglycine (Ing) and l-benz [ƒ] indanylglycine (Bfi), the Z-and E-isomers of dehydrophenylalanine and dehydronaphthylalanine (ΔZPhe, ΔEPhe, ΔZNal, ΔENal) and lo, o′- ...