A new glycoside, clerodendroside (A), C22H20O12·2H2O, mp 208-211°, which shows a hypotensive activity in a rat, was isolated from butanolic fraction of Clerodendron trichotomum Thunb. var. fargessii REHD. (Verbenaceae), and its structure was determined as 5, 6, 7-trihydroxy-4'-methoxyflavone 7-O-glucuronide by chemical degradation and spectral means.
