21633-80-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21633-80-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,3 and 3 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 21633-80:
(7*2)+(6*1)+(5*6)+(4*3)+(3*3)+(2*8)+(1*0)=87
87 % 10 = 7
So 21633-80-7 is a valid CAS Registry Number.