Abstract: A compound of formula or a prodrug and/or a pharmaceutically acceptable salt thereof, wherein X is O, N or S; R1 is hydrogen, halo, hydroxy, substituted or unsubstituted alkyl, substituted or unsubstituted hydroxyalkyl, substituted or unsubstituted alkylamine, alkoxy, substituted or unsubstituted aryl or heteroaryl, and substituted or unsubstituted aralkyl or heteroaralkyl; R2 is hydrogen, halo, hydroxy, substituted or unsubstituted alkyl, substituted or unsubstituted hydroxyalkyl substituted or unsubstituted alkylamine, alkoxy, substituted or unsubstituted aryl or heteroaryl, and substituted or unsubstituted aralkyl or heteroalkyl; R3 is hydrogen, halo, hydroxy, substituted or unsubstituted alloy substituted or unsubstituted hydroxyalkyl, substituted or unsubstituted alkylamine alkoxy, substituted or unsubstituted aryl or heteroaryl, and substituted or unsubstituted aralkyl or heteroalkyl; and R4-R7, is used to represent groups R4, R5, R6 and R7 which are H, OH, alkyl, alkoxy, alkylamine, hydroxyalkyl, h

Abstract: A compound of formula or a prodrug and/or a pharmaceutically acceptable salt thereof, wherein X is O, N or S; R1 is hydrogen, halo, hydroxy, substituted or unsubstituted alkyl, substituted or unsubstituted hydroxyalkyl, substituted or unsubstituted alkylamine, alkoxy, substituted or unsubstituted aryl or heteroaryl, and substituted or unsubstituted aralkyl or heteroaralkyl; R2 is hydrogen, halo, hydroxy, substituted or unsubstituted alkyl, substituted or unsubstituted hydroxyalkyl substituted or unsubstituted alkylamine, alkoxy, substituted or unsubstituted aryl or heteroaryl, and substituted or unsubstituted aralkyl or heteroalkyl; R3 is hydrogen, halo, hydroxy, substituted or unsubstituted alloy substituted or unsubstituted hydroxyalkyl, substituted or unsubstituted alkylamine alkoxy, substituted or unsubstituted aryl or heteroaryl, and substituted or unsubstituted aralkyl or heteroalkyl; and R4-R7, is used to represent groups R4, R5, R6 and R7 which are H, OH, alkyl, alkoxy, alkylamine, hydroxyalkyl, h

Abstract: A range is disclosed of pyrimidine derivatives (I) which can act as inhibitors of cyclin dependent kinases (CDK's) and which thereby can provide useful therapeutic compounds for use in treatment of tumours or other cell proliferation disorders. The compounds of this invention bind to CDK molecules in a manner that appears to differ from that of known CDK inhibitors such as olomoucine and roscovitine.

Abstract: Benzimidazole-4-carboxamide compounds (I) which can act as potent inhibitors of the DNA repair enzyme poly(ADP-ribose) polymerase or PARP enzyme (EC 2.4.2.30), and which thereby can provide useful therapeutic compounds for use in conjunction with DNA-damaging cytotoxic drugs or radiotherapy to potentiate the effects of the latter. In formula (I), R and R′ may each be selected independently from hydrogen, alkyl, hydroxyalkyl (e.g. CH2CH2OH), acyl (e.g. acetyl or benzoyl) or an optionally substituted aryl (e.g. phenyl) or aralkyl (e.g. benzyl or carboxybenzyl) group. R is generally a substituted phenyl group in the most preferred compounds. The compounds may also be used in the form of pharmaceutically acceptable salts or pro-drugs.

Abstract: Method of treating a tumour or other cell proliferation disorder which comprises administering an effective amount of a purine compound which inhibits cyclic dependent kinase activity. Novel purine compounds and pharmaceutical compositions are also disclosed.

Abstract: A range of dipyridamole analogues useful for inhibiting transport of nucleosides or purines across cell membranes, thereby to potentiate the activity of various cytotoxic antitumor drugs, is disclosed.

Abstract: Quinazoline derivatives of formula: ##STR1## wherein R represents: (1) a straight or branched chain unsaturated hydrocarbon group, or(2) a straight or branched chain saturated or unsaturated hydrocarbon group which is substituted by at least one: heteroatom, the or each heteroatom being halogeno when R is a C.sub.1 hydrocarbon group; or saturated carbocyclic group; or group containing at least one heteroatom, the or each heteroatom being O, N or S when R contains a cyclic group; andn is O or an integer of 1-4;X or, when n is an integer of at least 2, each X independently, represents a halogeno, C.sub.1 -C.sub.4 alkyl, aryl or aralkyl group or a group including at least one heteroatom; andY represents a group of formula: ##STR2## wherein m.gtoreq.1 (poly-L-glutamates); and the pharmaceutically acceptable salts and esters thereof, which are suitable as anti-cancer agents.

Abstract: Quinazoline derivatives of formula: ##STR1## wherein R represents: (1) a straight or branched chain unsaturated hydrocarbon group, or(2) a straight or branched chain saturated or unsaturated hydrocarbon group which is substituted by at least one: heteroatom, the or each heteroatom being halogeno when R is a C.sub.1 hydrocarbon group; or saturated carbocyclic group; or group containing at least one heteroatom, the or each heteroatom being O, N or S when R contains a cyclic group; andn is 0 or an integer of 1-4;X or, when n is an integer of at least 2, each Xindependently, represents a halogeno, C.sub.1 -C.sub.4 alkyl, aryl or aralkyl group or a group including at least one heteroatom; andY represents a group of formula: ##STR2## wherein m.gtoreq.1 (poly-L-glutamates); and the pharmaceutically acceptable salts and esters thereof, which are suitable as anti-cancer agents.