An alternate spelling or variant form of bromothymol, a blue dye indicator used in pH testing.
From 'brom-' (bromine) + 'thymol' (derived from thyme). This is simply an alternative spelling without the 'o' between 'brom' and 'thymol'.
Bromthymol and bromothymol are the same chemical with different spellings—scientists sometimes use both interchangeably, which can confuse chemistry students! It's a reminder that chemical nomenclature isn't always perfectly consistent.
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