"Carl Djerassi (October 29, 1923 \u2013 January 30, 2015) was an Austrian-born Bulgarian-American chemist, novelist, and playwright best known for his contribution to the development of oral contraceptive pills."@en . . "2015Z"^^ . . . "2015-01-30Z"^^ . . . . "Djerassi, Carl"@en . . "1923-10-29Z"^^ . . "2015-01-31Z"^^ . "1923Z"^^ . . . . . "American chemistry professor, inventor, author, playwright" . . . . "Carl Djerassi"@en .