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868 Wisconsin Academy of Sciences, Arts, and Letters . 
quercetin and the closely related kaempherol. 2 The glucoside 
delphinin is a compound of one molecule of delphinidin with two 
of glucose. • 
Delphinidin is isomeric with quercetin and morin. The struc¬ 
tural formula most favored by Willstaetter is given above. 
Myrtillidin, 
CH 
CH 
monomethyl ether of delphinidin. 
CH_COH 
r>i v -u 
= A_ c _ c /^> 
c= c 
I 
H 
COH 
CH 
COH 
COH 
Myrtillidin hydrochloride 
Myrtillidin was found by Willstaetter to exist in the form of 
the glucoside myrtillin in combination with one molecule of 
glucose in the fruit of the bilberry, Vaccinium myrtillus; * 1 also 
as the glucoside althaein in the blossoms of Althaea rosea, 2 the 
wild mallow. Myrtillidin is isomeric with rhamnetin and 
isorhamnetin, monomethyl ethers of quercetin. 
2 Jr. Chem. Soc., 73, p. 275; 81, p. 585. 
1 Ann., 408, p. 103. 
a Ann., 408, p. 110. 
