(S)-cis-3-ethyl-1,2,3,4,6,11-hexahydro-1,3,5,12-tetrahydroxynaphthacene-6,11-quinone is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 81844-85-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,8,4 and 4 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 81844-85: (7*8)+(6*1)+(5*8)+(4*4)+(3*4)+(2*8)+(1*5)=151 151 % 10 = 1 So 81844-85-1 is a valid CAS Registry Number.