| http://www.w3.org/ns/prov#value | - A compound which is a pyrido[3,4-b]derivative of formula (I) ##STR1## in which R is a hydrogen atom or an alkyl carbonyl, arylalkylcarbonyl or arylcarbonyl group of formula COR1 wherein R1 is a C1 -C6 alkyl group, a benzyl group or a phenyl group unsubstituted or substituted with 1 to 3 substituents chosen from halogen atoms and trifluoromethyl, C1 -C3 alkyl and C1 -C3 alkoxy groups or R is an alk
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