def spc_dict_to_arc_input(spc_dict):
    """
    Convert a species dictionary to an ARC input format
    
    Args:
        spc_dict (dict): A dictionary contains species information
    
    Returns:
        spc_list (list): A list contains equivalent species information in ARC format
    """
    spc_list = list()
    for label, spc in spc_dict.items():
        d = {}
        d['label'] = label
        d['smiles'] = spc.molecule[0].to_smiles()
        d['adjlist'] = spc.molecule[0].to_adjacency_list()
        d['multiplicity'] = spc.multiplicity
        spc_list.append(d)
    return spc_list