Virobay Inc., a San Francisco-based virtual biopharma company, has secured $5.47 million of a $31.5 million Series A round, according to a regulatory filing cited by PE Week Wire.

Backers include TPG Biotechnology Partners, Sutter Hill Ventures and Alta Partners. Executives include Stephanie Marrus (formerly with Vertex Pharma) and Kyle Elrod (formerly with Roche Palo Alto). TPG principal Heather Preston also is listed as an executive officer, the report said.