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alkannin natural red 20 alkanet extract anchusaic acid anchusin dye pigment paint indicator borage alkanna tinctoria food colouring cosmetics additive food adjuvants ingredient agent ins number e103 r-enantiomer shikonin racemic mixture shikalkin biosynthesis molecule molecular formula skeletal structural structure geometry ball stick tautomer isomer stereoisomer orbital structure activity relationship sar racemate naphthoquinone roots red-purple red 3d chemistry