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Ocracoke Island	ocrea	o-cresol	o-cresolsulfonphthalein	o-cresyl(ic) acetate
OCS	oct-	Oct.	oct.	octa-
octabenzone	octacaine	octachlorodipropyl ether	octachlorohexamolybdenum II tetrachloride	octachlorohexamolybdenum tetrachloride
octachord	octacosane	octacosanol	octacosyl	octad
octadeca-	octadecadienoic acid	octadecandioic acid	octadecane	octadecane diacid
octadecannamide	octadecanoic acid	octadecanol	octadecanoyl	octadecatrienol
octadecendioic acid	octadecene diacid	octadecene dicarboxylic acid	octadecene nitrile	octadecenic acid
octadecenoic acid	octadecoic acid	octadecyl	octadecyl alcohol	octadecyl bromide
octadecylic acid	octadecyl palmitate	octadecyltrimethylammonium pentachlorophenate	octadecyne	octadecynoic acid
octadic	octadiene	octadienoic acid	octafluorocyclobutane	octafluoropropane
octafunctional initiator	octagon	octagonal	octahedra	octahedral
octahedral complex	octahedral compound	octahedron	octahydroestrone	octahydro-naphthalene