Goniodiol (compound 5) is a natural producr that can be found in Goniothalamus cardiopetalus[1].
References
[1] Hisham A, et al. Cardiobutanolide, a styryllactone from Goniothalamus cardiopetalus. Phytochemistry. 2003 Feb;62(4):597-600. DOI:10.1016/s0031-9422(02)00536-8
![(6R)-6-[(1R,2R)-1,2-Dihydroxy-2-phenylethyl]-5,6-dihydro-2H-pyran-2-one Structure](/CAS/20150408/GIF/96422-52-5.gif)