125 
after being treated with hydrolizing agents splits up into a sugar and 
a colouring matter of the composition C 15 H 10 0 6 , which is probably 
identical with the substance isolated for the first time by Stenhouse 
and to which consequently must be applied the name of datiscetin. 
The substance when quite pure does not contain any methoxy — 
or in general, any alkyloxy groups. It contains four hydroxyl groups 
as has been shown by the investigation of its acetyl and benzoyl 
compound. At the same result we have arrived again by studying 
the behaviour of datiscetin towards bezosulphonchloride. 
Tetrabenzosulphoyldatiscetin. 
The reaction between datiscetin and benzosulphonchloride takes 
place readily under the following conditions: 5 gr of the colouring 
matter were dissolved in 50 gr of dry, pure pyridine and the mix¬ 
ture treated at 0° with 12*3 gr benzosulfonchloride, which was ad¬ 
ded gradually in small quantities. The brown solution was kept at 
ordinary temperature for 24 hours and then poured into diluted 
sulphuric acid. The reaction product was filtered after it had been 
in contact for two days with the acid and crystallized from boiling 
acetic acid. A brown admixture of the crystalls may be removed 
by heating their acetic acid solution with some charcoal. We ob¬ 
tained in this manner white needles united into pretty stars, which 
melted at 188°. They dissolve comparatively easily in acetic acid 
but are almost insoluble in alcohol and ether. 
Analysis: 
a •' 
1) 0-1576 gr gave 0*3207 gr CO, and 004/0 gr H 2 0 and 0-1786, 
gr Ba S0 4 (after Dennstädt), 
2) 0-1706 gr gave 0-3448 gr C0 2 and 0-0501 gr H 2 0 and 0-1848 
gr Ba S0 4 , 
3) 0-1728 gr gave 0-3510 gr C0 2 and 0*0486 gr H 2 0, 
4) 0 2010 gr gave 0 2249 gr BaS0 4 ; 
found 
C, 55-47%, 55-12%, 55’29%. middle 55*29% 
H, 3-26%, 3-34%. 3-14%, „ 3-24% 
S, 15-54%. 14-86%'. 15-36%, „ 15-25%. 
The formula C 15 H 6 0 6 (S0 2 .C 6 H 5 ) 4 requires: 
