Abstract: The invention relates to compounds of the formula and to pharmaceutically acceptable salts thereof, wherein R1, R2 and Z are as defined herein. The invention also relates to pharmaceutical compositions containing the compounds of formula I and to methods of using said compounds in the treatment of hyperproliferative diseases such as cancer.

Abstract: The invention relates to compounds of the formula 1

Abstract: This invention relates to certain heterocyclic compounds and their pharmaceutically acceptable salts, which are useful for sensitizing multidrug-resistant tumor cells to anticancer agents and multidrug resistant forms of malaria, tuberculosis, leishmania and amoebic dysentery to chemotherapeutants. The compounds and their pharmaceutically acceptable salts are also inhibitors of the active drug transport capability of P-glycoprotein which is encoded by the human MDR1 gene, as well as of certain other related ATP-binding-cassette transporters from eukaryotic and prokaryotic organisms (e.g., pfmdr from Plasmodium falciprum, and murine mdr1 and mdr3 gene products).

Abstract: A compound of the formula ##STR1## and pharmaceutically acceptable salts and prodrugs thereof wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are as defined below, methods and intermediates useful in the preparation thereof, pharmaceutical compositions thereof and methods of treatment therewith. The compounds of the above formula are useful in inhibiting oncogene products and as antitumor and anticancer agents.