Abstract
Sandaracopimarinol, one of the diterpenes, has been isolated for the first time along with β-sitosterol from deep seawater pumped up from 687 m in the Suruga Bay. Sandaracopimarinol has been found in the Japanese cedar (“Sugi” Cryptomeria japonica), which is widely planted in the eastern Japan. We speculate that the above organic compounds have been discharged by rivers to the seawater from terrestrial environment.