Anhalidine
| Names | |
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| Preferred IUPAC name
 6,7-Dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinolin-8-ol  | |
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| Properties | |
| C12H17NO3 | |
| Molar mass | 223.272 g·mol−1 | 
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). 
Infobox references  | |
Anhalidine is a naturally occurring tetrahydroisoquinoline based alkaloid which can be isolated from Lophophora williamsii; it has also been detected other cactii and several species of Acacia. It is part of a family of compounds that are structurally related to mescaline. Anhalidine has been found to act as a potent inverse agonist of the serotonin 5-HT7 receptor.