▁constitu ent ▁of ▁a ▁phen yle th yl ▁tail ). ▁ ▁Also ▁of ▁note : ▁ar ene - flu or in ated ▁pseud otrop ine ary le thers ▁with ▁respect ▁to ▁ ▁Pi per id ine ▁Anal og ues ▁▁ ▁See : ▁List ▁of ▁m eth yl phen id ate ▁analog ues ▁ ▁Many ▁of ▁the ▁pi per id ine ▁analog ues ▁of ▁c oca ine ▁serve ▁as ▁the ▁' missing ▁link ' ▁between ▁the ▁c oca ine ▁structure ▁and ▁that ▁of ▁the ▁m eth yl phen id ate ▁class ▁of ▁dru gs . ▁For ▁example , ▁DM N PC ▁pres erves ▁an ▁orientation ▁similar ▁to ▁the ▁ph eny lt rop anes , ▁but ▁is ▁a ▁struct ural ▁is omer ▁of ▁m eth yl nap h th id ate . ▁ ▁The ▁above ▁dep ict s ▁the ▁ 3 D ▁structure ▁of ▁the ▁above - ment ioned ▁m eth yl nap h th id ate ▁shown ▁with ▁the ▁same ▁model ing ▁for ▁the ▁c oca ine ▁derivative ▁W IN ▁ 3 5 4 2 8 , ▁a ▁simple ▁ph eny lt rop ane ▁with ▁a ▁short ▁addition ▁to ▁its ▁para ▁position . ▁This ▁overlay ▁shows ▁the ▁clos eness ▁of ▁where ▁the ▁two ▁hold ▁their ▁respective ▁o xygen ▁and ▁nit rog ens ▁in ▁their ▁structure ▁( also ▁their ▁ben z ene ▁& ▁cy clo alk ane ▁ring ▁form ations ) ▁and ▁is ▁meant ▁to ▁convey ▁a ▁sense ▁of ▁their ▁similarity ▁for ▁binding ▁to ▁M AT . ▁Cor respond ingly ▁most ▁other ▁mon o am