158991-40-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 158991-40-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,8,9,9 and 1 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 158991-40:
(8*1)+(7*5)+(6*8)+(5*9)+(4*9)+(3*1)+(2*4)+(1*0)=183
183 % 10 = 3
So 158991-40-3 is a valid CAS Registry Number.
158991-40-3Relevant articles and documents
A Concise Synthesis of the Anthraquinone Portion of Dynemicin A
Magnus, Philip,Eisenbeis, Shane A.,Magnus, Nicholas A.
, p. 1545 - 1546 (2007/10/02)
Addition of the lactone anion derived from 29 to 13 gave the adduct 30, which was dehydrated to give 20; subsequent conversion of 20 into the anthraquinone 26 was achieved in two steps.