The title triterpene. C30H50O2. is an 18α-oleanane derivative prepared by the Wagner–Meerwein rearrangement of betulin with Bi(OTf)3. xH2O (OTF is trifluoromethanesulfonate). https://www.roneverhart.com/Cookies-X-G-Pen-Roam-Portable-E-Rig-Vaporizer/