89508-13-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 89508-13-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,5,0 and 8 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 89508-13:
(7*8)+(6*9)+(5*5)+(4*0)+(3*8)+(2*1)+(1*3)=164
164 % 10 = 4
So 89508-13-4 is a valid CAS Registry Number.
89508-13-4Relevant academic research and scientific papers
Syntesis of the new tricyclic system thieno pyridopyrazin-4-one
Frehel, Daniel,Maffrand, Jean-Pierre
, p. 143 - 149 (2007/10/02)
The new tricyclic system thienopyrido(1,2-a)pyrazin-4-one, a thiophenic isostere of the heterocyclic system pyrazino(1,2-a)isoquinolin-4-one is synthesised by cyclization in acidic medium from 4-acyl-6-hydroxy-1-piperazin-