title: Structure-activity relationship studies of antiviral N-quinolin-4-yl-N'-benzylidenehydrazine derivatives by discriminant analysis.
abstract: The classification technique of linear discriminant analysis (LDA) is applied for studying the structure-activity relationship among antiviral N-quinolin-4-yl-N'-benzylidenehydrazine (II) derivatives. The total hydrophilicity of substituents in the benzylidene moiety along with 4 indicator variables is found to significantly (p less than 0.001) discriminate 25 inactive congeners of (II) from 28 active congeners with more than 80% posterior classification ratio. The predictive stability of the discriminant functions is established by the leave-one-out procedure. In the light of the posterior probabilities of assignment calculated from these functions it is observed that ethoxy group at position 7 and methoxy group at positions 8 and 6 in the quinoline system favour activity while a methoxy group at ortho or para position in the phenyl ring decreases activity. In view of the finer classification within the active class the three-group analysis is also performed using LDA and the adaptive-least-squares techniques.
mesh_terms: D000998:Antiviral Agents / Q000138:chemical synthesis / Q000145:classification / Q000494:pharmacology*; D001597:Benzylidene Compounds / Q000138:chemical synthesis / Q000145:classification / Q000494:pharmacology*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D006834:Hydrazines / Q000138:chemical synthesis / Q000145:classification / Q000494:pharmacology*; D011804:Quinolines / Q000138:chemical synthesis / Q000145:classification / Q000494:pharmacology*; D013223:Statistics as Topic; D013329:Structure-Activity Relationship
chemical_list: D000998:Antiviral Agents; D001597:Benzylidene Compounds; D006834:Hydrazines; D011804:Quinolines