Precursors---------> Alkaloids Included:

Precursors---------> Alkaloids Included:

Precursors---------> Alkaloids Included:

1.Ornithine, putrescine, proline-----> Pyrrole, pyrrolizidine, tropane.

2.Lysine ------> Pyridine, norlupinane.

3.Tyrosine, phenylalanine----->Protoalkaloids, isoquinoline.@@@@@

4.Tryptophan, tryptamine---->Quinoline, indole.

5.Histidine, threonine----->Imidazole.

6.Adenine, purine, xanthine, hypoxanthine------>Purine.

7.Acetate or mevalonic acid------>Steroidal and terpenoid pseudoalkaloids.

Precursors                              Alkaloids Included

Ornithine, putrescine, proline      Pyrrole, pyrrolizidine, tropane

Lysine      Pyridine, norlupinane

Tyrosine, phenylalanine     Protoalkaloids, isoquinoline

Tryptophan, tryptamine     Quinoline, indole

Histidine, threonine     Imidazole

Adenine, purine, xanthine, hypoxanthine     Purine

Acetate or mevalonic acid     Steroidal and terpenoid pseudoalkaloids