37,39,41-tris(carboxylmethoxy)-5,11,17,23,29,35-hexakis(1,1-dimethylethyl)-38,40,42-trimethoxycalix<6>arene is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 138709-57-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,7,0 and 9 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 138709-57: (8*1)+(7*3)+(6*8)+(5*7)+(4*0)+(3*9)+(2*5)+(1*7)=156 156 % 10 = 6 So 138709-57-6 is a valid CAS Registry Number.