How many letters does the top answer for “the conversion of a compound into an isomer of itself” have?

The most common answer is isomerisation (13 letters).

Crossword clue: the conversion of a compound into an isomer of itself

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

isomerisation 13 letters wn-def

the conversion of a compound into an isomer of itself

isomerization 13 letters wn-def

the conversion of a compound into an isomer of itself