680981-21-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 680981-21-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,8,0,9,8 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 680981-21:
(8*6)+(7*8)+(6*0)+(5*9)+(4*8)+(3*1)+(2*2)+(1*1)=189
189 % 10 = 9
So 680981-21-9 is a valid CAS Registry Number.
680981-21-9Relevant articles and documents
Poly(ester amide)s derived from L-malic acid
Regano,Alla,Martinez De Ilarduya,Munoz-Guerra
, p. 2067 - 2075 (2004)
A series of aregic poly(ester amide)s (ar-PEALM) with ester to amide groups ratios (a:b) ranging from 1:50 up to 1:2 were prepared from O-methyl-L-malic acid, 1,6-hexanediol, and 1,6-hexanediamine. The ester linkage was incorporated in the poly(ester amid
