7,8,17,18-tetrahydrodibenzo-<1,4,9,12>tetraoxacyclohexadecane-5,10,15,20-tetrone is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 16709-52-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,7,0 and 9 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 16709-52: (7*1)+(6*6)+(5*7)+(4*0)+(3*9)+(2*5)+(1*2)=117 117 % 10 = 7 So 16709-52-7 is a valid CAS Registry Number.