| http://www.w3.org/ns/prov#value | - The starting compounds of formula V wherein A1 is N may themselves be obtained, for example by reacting the appropriate iminoether of the formula Q.C(OR)???NH in which Q is 2-furyl and R is (1-4C)alkyl such as methyl or ethyl (formed from the corresponding nitrile of the formula Q.CN and alcohol of the formula R.OH in the presence of an anhydrous acid such as hydrogen chloride) with an aminoguanid
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