In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis and biological evaluation of novel bis-quaternary ammonium compounds with p-terphenyl spacer, published in 2020-07-31, which mentions a compound: 693-67-4, mainly applied to quaternary ammonium compound terphenyl spacer preparation SAR; antibacterial antifungal cytotoxicity human, Related Products of 693-67-4.
Bis-quaternary ammonium compounds I·2 Br- [R = H(CH2)n; n = 7, 8, 9, 10, 11] with a p-terphenyl spacer between two pyridinium heads were synthesized. I·2 Br- (n = 8) was superior to the known benzalkonium chloride, miramistin and chlorhexidine bisgluconate in its MIC values against five pathogenic bacteria.
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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem