Sorry, was away for 2 days. But this is Kane response. Don't know what to think. Is it good batch? Why does he send salt without asking if there are multiple seti choices? Is it reasonable to ask for a part refund if i send it back?
Hi, friend,
Regarding this setipiprant batch and your test report from your tester, we have to explain as below.It`s very crucial.
1.We have two forms of setipiprant, base form and salt form( sodium form, which can be dissolved in ethanol easily)
Many customers want salt form because they cant dissolve base/acid version of setipiprant in ethanol. It`s why we sell both, and stop base form now, as every customer requests the salt form.
Please check details as below.
Setipiprant (base /acid version)
molecular formula: C24H19FN2O3
molecular weight: 402.42
Setipiprant sodium(salt form)
molecular formula: C24H18FN2NaO3
molecular weight: 424.4
Structures as below.
2.
1) HPLC report is used to confirm the purity in usual. NMR and LCMS used for confirm the chemical structure in usual.
2) HPLC report of base form and salt form can be almost identical if they`re tested in same time.=, same conditions. With correct buffer etc.
So you tester said his HPLC can confirm our sample is not setipiprant, it`s not correct.
And the fact is , what he tested is not setipiprant base form ,it`s
setipiprant salt form.
3. We used the attached literature of synthesis route to produce setipiprant base, and produce setipiprant sodium is very simple.
You can find the standard datas of HNMR of base form in literature. and I attached the HNMR of our setipiprant base form. You can find our Setipiprant is correct. Forward these reports to any PHD with the right expertise for interpretation and they will confirm this.
However, you can`t use this HNMR data of base form to compare with setipiprant sodium form. HNMR reports of base form and salt form are different.
I also attached two batches HNMR reports of salt form.
4. It is clear now that your tester don`t know it`s salt form that you have sent him, and not sure of even same sample in different time,the retention time can be different.
5. Ask your tester to run a HNMR and or LCMS on your sample, that is the only way to get proper chemical structure identification of this compound. Have this raw data analyzed by someone with expertise in this field.
6. If He won't do it, does not have the capabilities or equipment to do it, then we advice you to send a sample to a lab who is
able to do a HNMR + LCMS test to get a proper chemical structure confirmation.
7. We are
100% confident that it is the right form of setipiprant- salt with high purity (+- 99%), And would like to help you with partly covering the testing cost in this case if you wish to reach out to a professional facility. they should be able to 1. Do a HNMR, LCMS and , 2. do a proper interpretation.
This is the only way to to get this compound identified/tested property.
Finally,we guarantee you wont face any loss. If u find it`s not correct chemical or purity not good,we can make refund or exchanging new batch.It`s always our service agreement.
We hope that you get this compound properly tested.
If u have any question, please let us know.
Attached our lab tests for base + sodium form + literature.
Warm regards,
Kane