3d image of pyrrolizidine skeletal formula

pyrrolizidine heterocyclic organic compound alkaloid hexahydropyrrolizine 1-azabicyclooctane iminosugar herbal phytochemical phytotherapy plant herb natural herbalism pharmacognosy pharmacopoeia substance matter material component agent stuff reagent functional group precursor synthesis reaction production building block metabolite metabolism biosynthesis cycle mechanism pathway path catabolism biosynthetic intermediate biogenesis substrate derivative bioprecursor metabolic endogenous 3d