123131-09-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 123131-09-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,3,1,3 and 1 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 123131-09:
(8*1)+(7*2)+(6*3)+(5*1)+(4*3)+(3*1)+(2*0)+(1*9)=69
69 % 10 = 9
So 123131-09-9 is a valid CAS Registry Number.
123131-09-9Relevant articles and documents
FROM STEROIDS TO MACROLIDES
Prelle, Annette,Winterfeldt, Ekkehard
, p. 333 - 346 (2007/10/02)
Ansa-seco steroids of type 2 - easily obtained from ring B 5,7-butadienes - are shown to undergo stereoselective epoxidation reactions and regioselective Baeyer-Villiger oxidations to form 15-membered lactones.
