Pfizer Discovery Technology Center, 620 Memorial Drive, Cambridge, MA 02139, USA. jason_johnson@merck.com|Pfizer Discovery Technology Center, 620 Memorial Drive, Cambridge, MA 02139, USA. jason_johnson@merck.com|Pfizer Discovery Technology Center, 620 Memorial Drive, Cambridge, MA 02139, USA. jason_johnson@merck.com|Pfizer Discovery Technology Center, 620 Memorial Drive, Cambridge, MA 02139, USA. jason_johnson@merck.com|Pfizer Discovery Technology Center, 620 Memorial Drive, Cambridge, MA 02139, USA. jason_johnson@merck.com|Pfizer Discovery Technology Center, 620 Memorial Drive, Cambridge, MA 02139, USA. jason_johnson@merck.com