Abietic acid
Chemical name	13-isopropylpodocarpa -7,13-dien-15-oic acid
Chemical formula	C19H29COOH
Molecular mass	302.44 g/mol
CAS number	514-10-3
EINECS number	208-173-3
Appearance	yellow resinous powder, crystals or chunks
Melting point	173°C
Boiling point	250°C at 9 mmHg

Abietic acid (also known as abietinic acid or sylvic acid) is the primary irritant in pine, isolated from rosin (via isomerization), and used in lacquers, varnishes, and soaps. Its ester is called an abietate.