Kenyan Croton sylvaticus Hochst. ex Krauss gave four clerodane diterpenoids, the new ent-3,13E-clerodadiene-15-formate (1), the known 15-acetoxy-ent-3,13E-clerodadiene (2), ent-3,13E-clerodadien-15-ol (3) and hardwickiic acid (4), two known halimane diterpenoids, penduliflaworosin (5) and crotohalimaneic acid (6) and one labdane diterpenoid, labda-13E-ene-8a,15-diol (7). The compounds, when tested for their anti-microbial activities against Bacillus subtilis, Xanthomonas campestris and Candida albicans, were found to be inactive.