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CAMBRIDGE, Mass. — Ironwood Pharmaceuticals, one of Cambridge’s largest biotech firms, is officially spinning off a new company Monday to treat rare diseases. And if you want a symbol of their diverging paths, look no further than the laboratory that Ironwood has used in the sleek curved building it occupies on Binney Street.

Ironwood has leased more than 200,000 square feet on the first three floors for several years, and dozens of its scientists have worked in the second-floor lab. Now it will be used by the spinoff, Cyclerion Therapeutics, which has taken over that floor. Ironwood will operate from part of the first and third floors and won’t have its own lab.

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