The CAS Registry Mumber 59854-14-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,9,8,5 and 4 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 59854-14: (7*5)+(6*9)+(5*8)+(4*5)+(3*4)+(2*1)+(1*4)=167 167 % 10 = 7 So 59854-14-7 is a valid CAS Registry Number.