Patent ID: 6887903

Claim:
A compound of formula 1 in which R is an aryl group, R is a straight or branched C 1 -C 16 -alkyl, trifluoromethyl, cyclohexyl, o-tolyl, 3-pyridyl, 2-pyridyl-ethyl, p-cyanophenylmethyl, p-aminophenylmethyl, 3-cyano-1-propyl, 4-aminobutyl group, an alkoxyethylene CH 3 â€”(CH 2 ) ni â€”(OCH 2 CH 2 ) mi â€” group in which n i is zero or 1 and m i is an integer 1 to 3, or a P 1 P 2 Nâ€”CH 2 â€”CH 2 â€” group in which P 1 and P 2 are independently H, C 1 -C 3 -alkyl, benzyloxy-carbonyl, Î±-, Î²- or Î³-pyridocarbonyl, carboxycarbonyl or carbalkoxycarbonyl, or P 1 and P 2 , when joined to the N atom which they are linked to, form a phthalimido, piperidino, morpholino residue; Râ€² is H or straight or branched C 1 -C 3 -alkyl and salts thereof with strong and medium bases.