Hexamethylenetetramine 

noun — A crystalline compound (C6H12N4) used especially as an accelerator in vulcanizing rubber and as a urinary antiseptic.

Abbreviation: HMTA

"Hexamethylenetetramine has moderate acute oral toxicity, is slightly irritating to the skin and mildly irritating to the eyes."

Hexamethylenetetramine by Maxy BG August 5, 2023

Hexaëteris 

A hexaëteris is the Greek name for the period within 6 tropical years where the Moon phase occurs around 6 days earlier.

It corresponds to 74 synodic months, 79.9828175276068 sidereal months, 80.30449221927401 draconic months, 79.30681173378679 anomalistic months, and 2,185.2635092592623 days.

Ben: The ultra supermoon 2016 was marked by the last lunar eclipse of 2022 after a hexaëteris.
Gregory: You know your stuff man.
Ben: Not to mention the last lunar eclipse of 2021 was a hexaëteris after my oldest grandfather's 81st birthday in 2015.
Gregory: Wow.

Hexaëteris by gregben October 2, 2023

Hexamethylenediamine 

Hexamethylenediamine is the organic compound with the formula H2N(CH2)6NH2. The molecule is a single diamine, consisting of a hexamethylene hydrocarbon chain. Somewhere around 1 billion hexamethylenediamines are produced annually

H₂N(CH₂)₆NH₂

WOAH, How did you produce hexamethylenediamine like that?? -Matthew

It's just simple science; you take a diamine, then you try to merge it together with a hexamethylene to form a single compound, hexamethylenediamine!

Hexamethylenediamine by Rphobia October 30, 2022