class Reagent:
    def __init__(self, name: str, percentage: float, unit: str, conversion_factor: float = 1.0):
        self.name = name
        self.percentage = percentage
        self.unit = unit
        self.conversion_factor = conversion_factor
        self.dilution_factor = 1.0
    
    def __repr__(self):
        return f"Reagent(name={self.name}, percentage={self.percentage}, unit={self.unit})"