21782-47-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21782-47-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,8 and 2 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21782-47:
(7*2)+(6*1)+(5*7)+(4*8)+(3*2)+(2*4)+(1*7)=108
108 % 10 = 8
So 21782-47-8 is a valid CAS Registry Number.
21782-47-8Relevant articles and documents
LONG-ACTING CONTRACEPTIVE AGENTS: CYCLOPROPYL AND CYCLOBUTYL ESTERS OF NORETHISTERONE
Shafiee, A.,Vossoghi, M.,Savabi, F.,Vlahov, R.,Tarpanov, V.,et al.
, p. 291 - 308 (1983)
Several esters of norethisterone (17α-ethynyl-17β-hydroxyestr-4-en-3-one) with carboxylic acids containing a cyclopropyl or cyclobutyl ring have been synthesized and the stereochemistries of the side-chains determined.