THCA may refer to:
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THC-A, Tetrahydrocannabinolic acid
*
T-HCA
''trans''-4-Hydroxycrotonic acid (T-HCA), also known as γ-hydroxycrotonic acid (GHC), is an agent used in scientific research to study the GHB receptor. It is an analogue of γ-hydroxybutyric acid (GHB), as well as an active metabolite of GHB ...
, trans-4-hydroxycrotonic acid
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