Abstract: A compound of formula (I): wherein: represents benzo or pyrido, optionally fused in the 2-3, 3-4 or 4-5 position to a phenyl, (C4-C8)cycloalkyl or heterocyclic group, which may be optionally substituted, W represents X—Y or Y—X, wherein: X represents and Y represents oxygen or N—R3, n represents zero or an integer from 1 to 6, G, R1, R2 and R3 are as defined in the description, its enantiomers and diastereoisomers, and addition salts thereof with a pharmaceutically acceptable acid or base, and medicinal products containing the same which are useful for the treatment of cancerous diseases.