15,5,45,5-tetramethyl-2,3,5,6-tetraaza-1,4(1,3)-dicyclohexana-cyclohexaphane-1,3,4,5-tetraene is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 21039-98-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,3 and 9 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 21039-98: (7*2)+(6*1)+(5*0)+(4*3)+(3*9)+(2*9)+(1*8)=85 85 % 10 = 5 So 21039-98-5 is a valid CAS Registry Number.