valaciclovir valacyclovir herpes infection drug molecule. skeletal formula.

valaciclovir valacyclovir herpes infection drug molecule skeletal formula aciclovir virus viral antiviral microorganism microbe simplex zoster shingles prodrug valine ester esterase varicella epsteinbarr cytomegalovirus vzv cmv carbon hydrogen oxygen nitrogen atoms atomic molecular compound composition chemical chemistry structure line drawing flat icon vector