| Member | Definition | Role |
|---|
| ephedrine | A phenethylamine alkaloid that is 2-phenylethanamine substituted by a methyl group at the amino nitrogen and a methyl and a hydroxy group at position 2 and 1 respectively. | (-)-ephedrine |
| hordenine | | hordenine |
| mescaline | A phenethylamine alkaloid that is phenethylamine substituted at positions 3, 4 and 5 by methoxy groups. | mescaline |
| norbelladine | A phenethylamine alkaloid that is tyramine in which one of the amino hydrogens has been replaced by a 3,4-dihydroxybenzyl group. | norbelladine |
| norpseudoephedrine | An amphetamine that is propylbenzene substituted by a hydroxy group at position 1 and by an amino group at position 2 (the 1S,2S-stereoisomer). | cathine |
| phenylpropanolamine | An amphetamine that is propylbenzene substituted by a hydroxy group at position 1 and by an amino group at position 2 (the 1R,2S-stereoisomer). It is a plant alkaloid. | (-)-norephedrine |
| synephrine | A phenethylamine alkaloid that is 4-(2-aminoethyl)phenol substituted by a hydroxy group at position 1 and a methyl group at the amino nitrogen. | synephrine |