| http://www.w3.org/ns/prov#value | - The intermediate amide of formula (II) (Q is --OH) can be prepared from the corresponding amidine (Q is --NH2) by alkaline hydrolysis, or can be derived from compounds of formula ##STR10## in which R is an ester group, preferably C1-4 alkyl, by ring closure employing, for example, sodium methylsulphinyl methanide in a suitable solvent such as dimethylsulphoxide.
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