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938045-28-4

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938045-28-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 938045-28-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,3,8,0,4 and 5 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 938045-28:
(8*9)+(7*3)+(6*8)+(5*0)+(4*4)+(3*5)+(2*2)+(1*8)=184
184 % 10 = 4
So 938045-28-4 is a valid CAS Registry Number.

938045-28-4Relevant articles and documents

Is samoquasine A indeed benzo[f]phthalazin-4(3H)-one? Unambiguous, straightforward synthesis of benzo[f]phthalazin-4(3H)-one and its regioisomer benzo[f]phthalazin-1(2H)-one

Monsieurs, Katrien,Tapolcsányi, Pál,Loones, Kristof T.J.,Neumajer, Gábor,Dirk De Ridder,Goubitz, Kees,Lemière, Guy L.F.,Dommisse, Roger A.,Mátyus, Péter,Maes, Bert U.W.

, p. 3870 - 3881 (2007)

In search for the structural elucidation of samoquasine A, a natural product isolated from the seeds of Annona squamosa L., two benzo[f]phthalazinone isomers have been synthesized. The synthetic pathway followed to build up these skeletons is based on the combination of two Suzuki reactions on a pyridazinone precursor and a ring closure reaction via a condensation reaction. 1H NMR data of the synthesized compound allowed to establish that the structure of the natural product samoquasine A is not benzo[f]phthalazin-4(3H)-one, as previously suggested.

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