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Fujita M, Itokawa H, Inoue J, Nozu Y, Goto N. 
“[On the cactus-alkaloids of Lophophora williamsii varcaespitosa (kobuki-ubadama)]”. 
Yakugaku Zasshi. 1972 Apr 22;92(4):482-9.
From Lophophora williamsii var. caespitosa, pellotine, anhalidine, anhalonidine, and anhalamine were obtained as phenolic alkaloids, and lophophorine was isolated as a non-phenolic alkaloid, ehich all belong to the tetrahydroisoquinoline system. A kind of betaine-type yellow components, anhalotine (=Y₁=I), Y₂(II), Y₃ (III), and peyotine (=Y₄=IV) were isolated. They were the derivatives of 6,7-demethoxy-3,4-dihydro-8-hydroxy isoquinolinium innersalt. Similar types of tautomerism were found in I and IV, and they had pKa; 6.0 and 6.5 respectively. Another type of tautomerism was found in II and III. II had pKa;5.6 and pKa; 10.9, and III had pKa; 6.7 and pKa; 11.4.
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