Calanolide A is an experimental non-nucleoside reverse transcriptase inhibitor (NNRTI). This compound was extracted from the Calophyllum lanigerum, of variety austrocoriaceum, trees in Lundu, Malaysian state of Sarawak in 1992 by United States National Cancer Institute (NCI). Due to rarity of the raw materials and low yield of the active ingredient, total synthesis of the compound was devised in 1996. For the same reason, its sister compound (-)-Calanolide B (also known as Costatolide) have been tauted as replacement. As a result of the discovery of Calanolide A, Sarawak Medichem pharmaceuticals company was established as a joint venture between US-based MediChem Research Inc and Sarawak state government. In 2006, Craun Research, a company established by Sarawak government, acquired Sarawa