** Shares in Sanofi SASY.PA fall 5% after the French drugmaker abruptly ousted its CEO Paul Hudson and appointed outgoing Merck KGaA MRCG.DE CEO Belén Garijo to the position
** Garijo's experience is broad, yet not especially associated with R&D productivity improvements at large pharma, Berenberg analyst Luisa Hector says
** "It is fair to say that Belen would not have been on many shortlists as potential successor given at Merck KGaA she arguably never reached the profile of prior executives there", says Jefferies
** Sanofi shares on track for their highest daily drop since early September
(Reporting by Alessandro Parodi)
((Alessandro.Parodi@thomsonreuters.com;))