81904-16-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81904-16-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,9,0 and 4 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 81904-16:
(7*8)+(6*1)+(5*9)+(4*0)+(3*4)+(2*1)+(1*6)=127
127 % 10 = 7
So 81904-16-7 is a valid CAS Registry Number.
81904-16-7Relevant articles and documents
DIE KONSTITUTION DER FUNGISTATISCHEN ANSAMYCIN-ANTIBIOTICA ANSATRIENIN A UND B
Damberg, Manfred,Russ, Peter,Zeeck, Axel
, p. 59 - 62 (2007/10/02)
The structure of ansatrienin A (1) and B (6) is assigned by spin decoupling experiments and chemical reactions.The anstatrienins are unique members among the ansamycin-antibiotics because of their substituent pattern in the ansa bridge.