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L-Luciferin is a competitive inhibitor of firefly Luciferin and can be used as an alternative substrate for light production, increasing the concentration of the enzyme or L-luciferin reduces the amount of light produced compared to D-Luciferin catalysis[1].

ChEBI: Ent-Photinus luciferin is a 1,3-thiazolemonocarboxylic acid consisting of 3,5-dihydrothiophene-4-carboxylic acid having a 6-hydroxybenzothiazol-2-yl group at the 2-position. It has a role as a luciferin and an animal metabolite. It is a 1,3-thiazolemonocarboxylic acid, a member of benzothiazoles and an imidothioate. It is a conjugate acid of an ent-Photinus luciferin(1-). It is an enantiomer of a Photinus luciferin.

[1] Lembert N. Firefly luciferase can use L-luciferin to produce light. Biochem J. 1996 Jul 1;317 ( Pt 1)(Pt 1):273-7. DOI:10.1042/bj3170273