Artemisinin Synonym: (1R,4S,5R,8S,9R,12S,13R)-1,5,9-trimethyl-11,14,15,16-tetraoxatetracyclo[10.3.1.04,13.08,13]hexadecan-10-one. Chemical Formula: C15H22O5 CAS number: 63968-64-9 DOI: 10.1056/NEJMc1612765