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You could try formazine...It is used in the combustion synthesis of various semiconductors IIRC. It can be synthesized from the reaction of hydrazine sulfate and hexamine and precipitates from aqueous solutions as an insoluble and relatively benign polymer.
https://en.wikipedia.org/wiki/Formazine

Good idea.  We have made other nitro-aromatics or -heteroaromatics and the carbon attached to the nitrogen is often broader than the others.

Generally Claisen condensation

Ester enolates can be formed with alkoxides, and they are good nucleophiles
Esters can undergo addition-elimination reactions with nucleophiles, otherwise known as nucleophilic acyl substitution. In the Claisen condensation the nucleophile is the ROC(O)CH2 group which displaces (RO-).
Alkoxides can be adequate leaving groups in this case, since they’re significantly weaker bases than ester enolates.
The product of a Claisen condensation is a beta-keto ester, which is a significantly stronger acid (pKa = 11) than either alcohols (pKa = 16-17) or esters (pKa = 25).
The reaction requires at least one equivalent of base since the enolate of the beta-keto ester product is not a strong enough base to deprotonate the starting ester.
A “crossed” Claisen condensation involves the enolate of one ester reacting as a nucleophile with a different (ideally non-enolizable) ester to give a beta-keto ester.

Mixed Claisen condensations are possible if the excess ester does not have protons at C-α. If both esters have α-protons, predominantly statistical mixtures of products can be expected.

We are short one signal in the C-13 spectrum; we could use LC-MS data to confirm this product.