81721-20-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81721-20-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,7,2 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 81721-20:
(7*8)+(6*1)+(5*7)+(4*2)+(3*1)+(2*2)+(1*0)=112
112 % 10 = 2
So 81721-20-2 is a valid CAS Registry Number.
81721-20-2Relevant articles and documents
5β-Hydroxy-Δ6 -steroids and process for the preparation thereof
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, (2008/06/13)
The disclosure concerns 5β-hydroxy-Δ6 -steroids of the general formula STR1 wherein R1 is hydrogen, acyl, lower alkyl, or the tetrahydropyranyl residue and R2, R3 individually are respectively hydrogen or jointl
