Cocaine receptor binding ligands

A compound of the formula below, ##STR9## wherein Y=CONRR.sub.2, R.sub.2 =hydrogen, C.sub.1-5 alkyl,

• X=H, C.sub.1-6 alkyl, C.sub.3-8 cycloalkyl, C.sub.1-4 alkoxy, C.sub.1-6 alkynyl, halogen, amino, acylamido,
• R and R.sub.2 independently are H, C.sub.1-6, alkyl, alkene or alkyne, phenyl, phenyl substituted with 1-3 of C.sub.1-6 alkyl, alkene, alkyne or alkoxy, C1-6 alkoxy, phenoxy, amine, amino substituted with 1 or 2 C.sub.1-6 alkyl, alkene, alkyne, alkoxy, phenyl or phenoxy, or R and R.sub.2 may combine to form a cyclic structure selected from the group consisting of pyrrolidinyl, morpholinyl and piperidinyl. moleties,
• Z=H, I, Br, Cl, F, CN, CF.sub.3 NO.sub.2, N.sub.3, OR.sub.1, CO.sub.2 NH.sub.2, CO.sub.2 R.sub.1, C.sub.1-6 alkyl, NR.sub.4 R.sub.5, NHCOF.sub.5, NHCOR.sub.6,
• wherein R.sub.4 -R.sub.6 are each C.sub.1-6 alkyl with the proviso that said compound comprises at least one .sup.11 C atom or Z is iodine selected from the group consisting of .sup.123 I.sub.125 and .sup.131 I.