Anacor Pharmaceuticals Inc., a Palo Alto, Calif.-based developer of topical therapeuticals, has filed for a $57.5 million IPO. It plans to trade on the Nasdaq under ticker symbol ANAC, with Morgan Stanley and Cowen & Co. serving as co-lead underwriters. VC backers include Rho Ventures, Venrock, Red Abbey Venture Partners and Aberdare Ventures. www.anacor.com