| abstract |
Compounds of formula (I), wherein R1 is selected from the group of H, OH, an alkoxy, OCOaryl, OCON(C1-C6alkyl)2, OCO(C1-C6alkyl), OCONH(C1-C6alkyl), OSO2(C1-C6alkyl), or halogen; R2 is selected from the group of H, OH, alkoxy, OCON(C1-C6alkyl)2, OCO(C1-C6alkyl), OCONH(C1-C6alkyl), OSO2(C4-C6alkyl), or halogen; with the proviso that when one of R1 and R2 is halogen, the other is not; and R3 is NR4R5, wherein R4 and R5 together with the nitrogen to which they are attached from a five- or six-membered heterocyclic ring as defined in the description. |