nicotidine

In chemistry|lang=en terms the difference between complex and nicotidine

is that complex is (chemistry) a structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules while nicotidine is (chemistry) a complex, oily, nitrogenous base, isomeric with nicotine, obtained by the reduction of certain derivatives of the pyridine group.

As nouns the difference between complex and nicotidine

is that complex is a problem while nicotidine is (chemistry) a complex, oily, nitrogenous base, isomeric with nicotine, obtained by the reduction of certain derivatives of the pyridine group.

As an adjective complex

is made up of multiple parts; composite; not simple.

As a verb complex

is (chemistry|intransitive) to form a complex with another substance.