Inspired by this result, we thought of investigating the role of substitution at the para position in a conformational change of the pyridine ring and we thought of synthesizing para-substituted 1,4-DHP. For the above purpose, we have chosen 1(h) as -amino -keto ester and for the para substitution, we have chosen benzaldehyde as aldehyde source keeping the rest of the reaction condition unchanged to obtain 2(h), shown in Scheme 3. We have observed the complete conversion in 4 hours. Later we purified the product 2(h) through column chromatography characterized by mass and kept it for crystallization in ethyl acetate. We have observed x-ray quality single crystal for 2(h) shown in Figure . From the crystal structure, we wonderfully observed the puckered conformation of 1,4-DHP with substitution at the para position hence matches with the literature observations. As we just want the product 2(h) for studying the role of substitution at the para position in conformation and thus, synthesizing and characterization other para-substituted DHP's of this series is beyond the scope of this paper.