TB is a triple bond. <.> is a dotted (coordinated) bond.
"Emphasis" _italics_ have a * mark.
[#] footnotes moved to EOParagraphs but NOT renumbered.
(They are numbered "a" or "b" when two pages of notes are together.)
Comments and guessed at characters in {braces} need stripped/fixed.
Greek letters are encoded in <gr > brackets, and the letters are
based on Adobe's Symbol font.