1,10-diaza-5,6,15,17-tetrathia-2,3:8,9:12,13,18:19-tetrabenzocyclododeca-10,20-diene is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 21620-34-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,2 and 0 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 21620-34: (7*2)+(6*1)+(5*6)+(4*2)+(3*0)+(2*3)+(1*4)=68 68 % 10 = 8 So 21620-34-8 is a valid CAS Registry Number.