138747-21-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 138747-21-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,7,4 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 138747-21:
(8*1)+(7*3)+(6*8)+(5*7)+(4*4)+(3*7)+(2*2)+(1*1)=154
154 % 10 = 4
So 138747-21-4 is a valid CAS Registry Number.
138747-21-4Relevant articles and documents
SYNTHESIS AND ISOMERIZATION RECYCLIZATION OF PYRAZINOINDOLES
Terenin, V. I.,Kabanova, E. V.,Baranova, N. A.,Bundel', Yu. G.
, p. 284 - 288 (2007/10/03)
A method for synthesis of pyrazinoindoles with alkyl substituents in position I was developed based on indole and isomerization recyclization of their quaternary salts into 9-aminopyridoindole derivatives was conducted.