Get prefix.
getPrefix(object, ...)# S4 method for compartment_bioavailability
getPrefix(object, ...)
# S4 method for compartment_lag_time
getPrefix(object, ...)
# S4 method for compartment_infusion_duration
getPrefix(object, ...)
# S4 method for compartment_infusion_rate
getPrefix(object, ...)
# S4 method for compartment_initial_condition
getPrefix(object, ...)
the prefix of this object
generic object
e.g. dest='mrgsolve'