155807-21-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 155807-21-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,5,8,0 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 155807-21:
(8*1)+(7*5)+(6*5)+(5*8)+(4*0)+(3*7)+(2*2)+(1*1)=139
139 % 10 = 9
So 155807-21-9 is a valid CAS Registry Number.