| abstract |
In the general formula (Ia) of the compounds of the present invention, X 1 is hydrogen, alkyl or alkyloxy; X2 is alkyl or alkyloxy; X3 is hydrogen or alkyl; R 1 and R 2 are predominantly or otherwise different from hydrogens or pellets; B is methylene, ethylene or vinyl; n is 0 or 1; Z is hydrogen or alkyl; m is 0 or 1; X4 is hydrogen, halogen, alkyl or alkyloxy; and the apiride tube coat is bonded to the carbon atoms or position relative to the nitrogen graft vapor, i.e., 2 or 3-pyridyl tubes. ŕ |