21387-33-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21387-33-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,3,8 and 7 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21387-33:
(7*2)+(6*1)+(5*3)+(4*8)+(3*7)+(2*3)+(1*3)=97
97 % 10 = 7
So 21387-33-7 is a valid CAS Registry Number.