(9R,20S)-9,20-Bis-hydroxymethyl-1,4,7,13,16-pentaoxa-10,19-diaza-cyclohenicosane-8,11,18,21-tetraone is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 139405-52-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,4,0 and 5 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 139405-52: (8*1)+(7*3)+(6*9)+(5*4)+(4*0)+(3*5)+(2*5)+(1*2)=130 130 % 10 = 0 So 139405-52-0 is a valid CAS Registry Number.