Structurally simple examples of them include the iridoids, which are based on a ten-carbon skeleton.  
Structurally simple examples of them include the iridoids, which are based on a ten-carbon skeleton.  Sterols and steroids are also examples, though their extensive modifications and cyclizations can obscure their parentage from a branched chain hydrocarbon.  More recognizable are long-chain plant pigments such as retinoids and carotenoids.  The key step in their biosynthesis is the HMG-CoA reductase pathway.  They characteristically have carbons in a multiple of five, a result of their biosynthesis from dimethylallyl pyrophosphate and isopentenyl pyrophosphate, activated forms of a particular saturated hydrocarbon.  FTP, name these common organic molecules composed of isoprene subunits.
Structurally simple examples of them include the iridoids, which are based on a ten-carbon skeleton.  
terpenoids (accept terpenes)