Collect. Czech. Chem. Commun.
1978, 43, 946-959
https://doi.org/10.1135/cccc19780946
Substituent effect in electronic and 1H-NMR spectra of 1- and 4-alkylated 3,5-dicyano-2,6-dimethyl-1,4-dihydropyridines
Lubomír Musil, Jaroslav Paleček and Josef Kuthan