33507-91-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 33507-91-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,5,0 and 7 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 33507-91:
(7*3)+(6*3)+(5*5)+(4*0)+(3*7)+(2*9)+(1*1)=104
104 % 10 = 4
So 33507-91-4 is a valid CAS Registry Number.
33507-91-4Relevant articles and documents
REARRANGEMENT OF 1,3,5,8-TETRAOXYGENATED XANTHONES IN HOT AQUEOUS MORPHOLINE
Bennett, Graham J.,Lee, Hiok-Huang
, p. 7265 - 7268 (1989)
Aqueous morpholine demethylation of 2-prenyl-1-hydroxy-3,5,8-trimethoxyxanthone leads to a mixture of 1,3,5,8- and 1,3,7,8-tetraoxygenated xanthones.
