Compounds of formula (I): (I) wherein Het, R<;sub>;3<;/sub>;, R<;sub>;4<;/sub>;, R<;sub>;5<;/sub>;, R<;sub>;7<;/sub>;, R<;sub>;8<;/sub>;, R<;sub>;9<;/sub>;, T, p, p', q, and q' are as defined in the description. Medicaments