Pteridines. Pteridinones . Pyrazinopyrimidines . Compounds based on pyrazino[2,3-d]pyrimidine which is a pyrimidine fused to a pyrazine, containing four NITROGEN atoms. . 0.82
Pteris. Brake Fern . Brake Ferns . Ferns, Brake . Pteri . Fern, Brake . A plant genus of the family PTERIDACEAE. Members contain entkaurane DITERPENES. The name is similar to bracken fern (PTERIDIUM). . 0.81