| http://www.w3.org/ns/prov#value | - (ii) Ar1 and Ar2 are each independently phenyl or pyridyl groups, preferably phenyl, and with the carbon to which they are commonly linked form a fused ring so that the compounds of formula (I) have the structure: ##STR17## where n is 0 to 3, preferably 1 to 3, more preferably 2 or 3; R2 is either alkyl in which the alkyl group is a straight or branched chain, preferably is lower alkyl containing
|
