[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][C][C][C][Branch1][C][C][Branch1][C][C][C@@H1][Branch2][Ring1][=N][/C][=C][/C@H1][C@@H1][Branch2][Ring1][Branch1][C][C][=Branch1][C][=O][C@@H1][Ring1][=Branch1][C][C][C][C][/C][=C][/C][=Branch1][C][=O][O][C][O][O]"}, {"from": "gpt", "value": "The molecule is a prostaglandin E1 (PGE1) analog and antiprogestogen used for preoperative dilation of the cervix before surgical abortion. It is available as vaginal suppositories and also used in combination with the antiprogestin and mifepristone for termination of 1st- and 2nd-trimester pregnancy. It is not FDA-approved but available in Japan marketed as Preglandin."}]