138810-72-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 138810-72-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,8,1 and 0 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 138810-72:
(8*1)+(7*3)+(6*8)+(5*8)+(4*1)+(3*0)+(2*7)+(1*2)=137
137 % 10 = 7
So 138810-72-7 is a valid CAS Registry Number.
138810-72-7Relevant articles and documents
Synthesis of 17-(isocyanotosylmethylene) steroids: precursors to pregnane derivatives
Leusen, Daan van,Leusen, Albert M. van
, p. 393 - 401 (2007/10/02)
The synthesis is described of a series of twenty 17-(isocyanotosylmethylene) steroids 5 from 17-oxo steroids and 4-tolylsulfonylmethyl isocyanide (TosMIC).Furthermore, nine analogous 17-(isocyanosulfonylmethylene) steroids (15-21a) have been prepared usin
