Spiramine B is a natural alkaloid.
References:
[1]. He HP, et al. New diterpene alkaloids from the roots of Spiraea japonica. J Nat Prod. 2001;64(3):379-380.
References:
[1]. He HP, et al. New diterpene alkaloids from the roots of Spiraea japonica. J Nat Prod. 2001;64(3):379-380.