131944-49-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 131944-49-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,9,4 and 4 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 131944-49:
(8*1)+(7*3)+(6*1)+(5*9)+(4*4)+(3*4)+(2*4)+(1*9)=125
125 % 10 = 5
So 131944-49-5 is a valid CAS Registry Number.
131944-49-5Relevant articles and documents
THERMAL REARRANGEMENT OF THE IMMUNOSUPPRESSANT FK-506
Ok, H.,Arison, B. H.,Ball, R. G.,Beatti, T. R.,Fisher, M. H.,Wyvratt, M. J.
, p. 6477 - 6480 (1990)
Treatment of FK-506 in xylene at reflux results in a sigmatropic rearrangement of the allylic ester portion of the molecule to give a new ring expanded macrolide.