Roseoside is a compound isolated from the leaves of Elaeocarpus japonicus[1].
References
[1] Shitamoto J, et al. Elaeocarpionoside, a megastigmane glucoside from the leaves of Elaeocarpus japonicus Sieb. et Zucc. J Nat Med. 2010;64(1):104-108. DOI:10.1007/s11418-009-0370-4