[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C@][C][C][C@H1][C@H1][Branch1][=C][C@@H1][Ring1][=Branch1][C][C][C@][Ring1][=Branch2][Branch1][Ring1][C][#C][O][C][C][C][=C][Ring1][=N][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O]"}, {"from": "gpt", "value": "Ethinylestradiol was first synthesized in 1938 by Hans Herloff Inhoffen and Walter Hohlweg at Schering. It was developed in an effort to create an estrogen with greater oral bioavailability. These properties were achieved by the substitution of an ethinyl group at carbon 17 of [estradiol]. Ethinylestradiol soon replaced [mestranol] in contraceptive pills.  Ethinylestradiol was granted FDA approval on 25 June 1943."}]