Patent ID: 7482452

Claim:
A compound of formula (2): wherein R is a —CN, —NO 2 , —CO 2 Alk 2 , —COC 1-6 alkyl or —CONHet 2 group; Alk 2 is an optionally substituted alkyl, arylalkyl, aryl, aryloxyalkyl, alkanoyloxyalkyl or aroyloxyalkyl group; NHet 2 is an optionally substituted 4- to 6-membered heterocycloalkyl group attached through a nitrogen atom to the group —CO; R 1 is an optionally substituted aryl, heteroaryl, cycloalkyl or heterocycloalkyl group; and each R y , which may be the same or different, is each a hydrogen atom or a hydrogen atom precursor; or a salt, protected derivative, or N-oxide thereof.