The CAS Registry Mumber 150356-92-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,0,3,5 and 6 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 150356-92: (8*1)+(7*5)+(6*0)+(5*3)+(4*5)+(3*6)+(2*9)+(1*2)=116 116 % 10 = 6 So 150356-92-6 is a valid CAS Registry Number.