The CAS Registry Mumber 93747-15-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,7,4 and 7 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 93747-15: (7*9)+(6*3)+(5*7)+(4*4)+(3*7)+(2*1)+(1*5)=160 160 % 10 = 0 So 93747-15-0 is a valid CAS Registry Number.