Hasan, Md Nazmul, et al. “2,5-Dihydroxy-3-Heptadecyl-1,4-Benzoquinone and Stigmasterol from Heliotropium Indicum L”. Dhaka University Journal of Pharmaceutical Sciences, vol. 15, no. 1, Aug. 2016, pp. 113-5, doi:10.3329/dujps.v15i1.29205.