This is a Phase I study to evaluate the safety, tolerability, PK of SR419 in healthy volunteers. The study will include 3 parts.~Part A is a double-blind, randomized, placebo-controlled, single-dose escalation study of SR419 in healthy young subjects.~Part B is a double-blind, randomized, placebo-controlled, repeated-dose escalation study of SR419 in healthy young subjects.~Part C is a double-blind, randomized, placebo-controlled, repeated dose study of SR419 in healthy elderly subjects.
This study is to evaluate the safety, tolerability, PK of SR419 in healthy volunteers.