claim: Elizabeth of York was the mother of more than one human.
evidence: Ecgonine -LRB- tropane derivative -RRB- is a tropane alkaloid found naturally in coca leaves .. tropane. tropane. tropane alkaloid. tropane alkaloid. coca. coca. It has a close structural relation to cocaine  : it is both a metabolite and a precursor , and as such , it is a controlled substance in many jurisdictions , as are some substances which can be used as precursors to ecgonine itself .. cocaine. cocaine. metabolite. metabolite. precursor. wiktionary :Precursor. controlled substance. controlled substance. Structurally , ecgonine is a cycloheptane derivative with a nitrogen bridge .. cycloheptane. cycloheptane. nitrogen bridge. nitrogen bridge. It is obtained by hydrolysis of cocaine with acids or alkalis , and crystallizes with one molecule of water , the crystals melting at 198 -- 199 ° C .. cocaine. cocaine. hydrolysis. hydrolysis. It is levorotary , and on warming with alkalis gives iso-ecgonine , which is dextrorotary .. levorotary. levorotary. dextrorotary. dextrorotary. It is a tertiary base , and has the properties of an acid and an alcohol .. base. Lewis base. It is the carboxylic acid corresponding to tropine , for it yields the same products on oxidation , and by treatment with phosphorus pentachloride is converted into anhydroecgonine , C9H13NO2 , which , when heated to 280 ° C with hydrochloric acid , eliminates carbon dioxide and yields tropidine , C8H13N .. carboxylic acid. carboxylic acid. tropine. tropine. phosphorus pentachloride. phosphorus pentachloride. anhydroecgonine. anhydroecgonine. hydrochloric acid. hydrochloric acid. carbon dioxide. carbon dioxide. tropidine. tropidine