Coniine, C8H17N, is found in the umbelliferous plant, Conium maculatum. Structurally, it is a propyl-piperidine, represented by the following formula:
Nicotine, C10H14N2, is the alkaloid of tobacco leaves. It is an extremely poisonous, oily liquid, with a strong odor and a burning taste. Its structural formula shows it to contain both a pyrridine ring and a pyrrolidine ring, linked together thus
Hygrine, C7H13NO, from coca leaves, is an acetic acid salt of pyrrolidine, represented by the following formula:
Atropine and hyoscyamine, C17H23NO3, are optical isomers. Atropine is an extremely poisonous, white crystalline compound, which is obtained from deadly nightshade and henbane, and used in medicine, in minute doses, as an agent for reducing temperature in acute cases of fevers. Structurally, it is a tropic acid ester of tropane, represented by the following formula:
Cocaine, C17H21NO4, is found in coca leaves. It is a white crystalline solid, which is largely used as a local anæsthetic for minor surgical operations. Its structural formula is