The CAS Registry Mumber 92735-17-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,7,3 and 5 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 92735-17: (7*9)+(6*2)+(5*7)+(4*3)+(3*5)+(2*1)+(1*7)=146 146 % 10 = 6 So 92735-17-6 is a valid CAS Registry Number.