: a vesicant crystalline unsaturated acid C5H8O2 with a spicy odor that is the stable stereoisomer of angelic acid and occurs in the form of esters especially in chamomile oil from a European chamomile (Chamaemelum nobile) and in croton oil
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“Tiglic acid.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/tiglic%20acid. Accessed 31 Oct. 2025.
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