1638221-34-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1638221-34-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,3,8,2,2 and 1 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1638221-34:
(9*1)+(8*6)+(7*3)+(6*8)+(5*2)+(4*2)+(3*1)+(2*3)+(1*4)=157
157 % 10 = 7
So 1638221-34-7 is a valid CAS Registry Number.