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Stereochemistry Prohibition Sign op.svg Stereochemisches Verbotsschild op Optische Reinheit im Anlehnung an DIN Stereochemical prohibition sign op Optical purity following DIN Own DPRauchenverboten svg by basierend auf DPRauchenverboten svg von Torsten Henning Sponk talk SVG signs Prohibition signs Red circle with left slash Stereochemistry