Chemical Reagents

4-Aminopyridine-3-Carboxylic Acid Ethyl Ester.

4-Aminopyridine-3-Carboxylic Acid Ethyl Ester.

This stable-labeled internal standard is suitable for quantification of 4-ANPP levels in urine or other matrices by LC/MS or GC/MS for clinical toxicology, forensic analysis, prescription monitoring, or urine drug testing applications. 4-ANPP, also

4-ANPP, also known as Despropionyl fentanyl, is an intermediate in the synthesis of fentanyl and related opioids and is often found as an impurity in fentanyl preparations. This stable-labeled internal standard is suitable for quantification of

Other Notes Please note that Sigma-Aldrich provides this product to early discovery researchers as part of a collection of unique chemicals. Sigma-Aldrich does not collect analytical data for this product.

This support is an excellent tool for the production of sulfonamides and anilides by SPOS [1] . Amines have been released from this resin with DDQ [2] and tertiary amides by acylation of resin-bound secondary amines with acid chlorides [3] .

This support is an excellent tool for the production of sulfonamides and anilides by SPOS [1] . Amines have been released from this resin with DDQ [2] and tertiary amides by acylation of resin-bound secondary amines with acid chlorides [3] .

This support is an excellent tool for the production of sulfonamides and anilides by SPOS [1] . Amines have been released from this resin with DDQ [2] and tertiary amides by acylation of resin-bound secondary amines with acid chlorides [3] .

4-Benzyloxybenzyl alcohol, polymer-bound

4-Benzyloxybenzyl alcohol, polymer-bound

4-Benzyloxybenzyl alcohol, polymer-bound

4-Biphenylacetic acid is a potential non-steroidal antiinflammatory agent and forms solid inclusion complex with &#946-cyclodextrin . 4-Biphenylacetic acid on interaction with quinolone antibacterial agents induces functional blockade of the