Compounds of the formula I in which X, Y, R1, R1\u2032, R2, R3 have the meanings indicated in Claim 1, are inhibitors of cell proliferation and can be employed for the treatment of tumors. The tube includes a forward end portion with an open front end of predetermined size and a rear end portion having an elbow receiving pocket adjacent an enlarged diameter rear opening. If desired the customer can orally request product information by speaking into a voice recognition system that controls a database of product specific information that is deliverable in either visual or audio form or both.