21787-15-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21787-15-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,8 and 7 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 21787-15:
(7*2)+(6*1)+(5*7)+(4*8)+(3*7)+(2*1)+(1*5)=115
115 % 10 = 5
So 21787-15-5 is a valid CAS Registry Number.