The CAS Registry Mumber 93236-05-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,2,3 and 6 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 93236-05: (7*9)+(6*3)+(5*2)+(4*3)+(3*6)+(2*0)+(1*5)=126 126 % 10 = 6 So 93236-05-6 is a valid CAS Registry Number.