1H-Pyrrole,1,3-di-2-propynyl-(9CI) is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 505904-72-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,0,5,9,0 and 4 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 505904-72: (8*5)+(7*0)+(6*5)+(5*9)+(4*0)+(3*4)+(2*7)+(1*2)=143 143 % 10 = 3 So 505904-72-3 is a valid CAS Registry Number.