Patent ID: 11866428
Assignee: ASTEX THERAPEUTICS LIMITED
Field: Pharmaceuticals (Chemistry)
Classification: CPC C  A | IPC A  C

Claim 5:
6. The protected form of formula (I) as defined in claim 1, wherein:
(i) R6 and R7 are independently selected from hydrogen, C1-6 alkyl, —Y—C3-12 carbocyclyl, —Z-(3-12 membered heterocyclyl), —(CRxRY)s—C(═O)ORz or —(CRxRY)s—O—Rz; or
(ii) R6 and R7 are both methyl; or
(iii) R6 and R7 groups, together with the carbon atom to which they are attached, join to form a 3-6 membered fully saturated carbocyclyl or heterocyclyl group, and which may be optionally fused to a 5-6 membered aromatic carbocyclyl or heterocyclyl ring, wherein said carbocyclyl and heterocyclyl groups may be optionally substituted by 1, 2 or 3 Rb groups.