Contains the Multi-Species Acute Toxicity Database (CAS & SMILES
    columns only) [United States (US) Department of Health and Human Services
    (DHHS) National Institutes of Health (NIH) National Cancer Institute (NCI),
    "Multi-Species Acute Toxicity Database",
    <https://cactus.nci.nih.gov/download/acute-toxicity-db/>] combined with the
    Toxic Substances Control Act (TSCA) Inventory [United States Environmental
    Protection Agency (US EPA), "Toxic Substances Control Act (TSCA) Chemical
    Substance Inventory",
    <https://www.epa.gov/tsca-inventory/how-access-tsca-inventory} and
    <https://cdxapps.epa.gov/oms-substance-registry-services/substance-list-details/169>]
    and the Agency for Toxic Substances and Disease Registry (ATSDR) Database
    [United States (US) Department of Health and Human Services (DHHS) Centers
    for Disease Control and Prevention (CDC)/Agency for Toxic Substances and
    Disease Registry (ATSDR), "Agency for Toxic Substances and Disease Registry
    (ATSDR) Database",
    <https://cdxapps.epa.gov/oms-substance-registry-services/substance-list-details/105>]
    in 2 data sets. One data set has a focus on the latter 2 databases and one
    data set focuses on the former database. Also contains the collection of
    chemical data from Wikipedia compiled in the US EPA CompTox Chemicals
    Dashboard [United States Environmental Protection Agency (US EPA) /
    Wikimedia Foundation, Inc. "CompTox Chemicals Dashboard v2.2.1",
    <https://comptox.epa.gov/dashboard/chemical-lists/WIKIPEDIA>].

A collection of functions that have been developed to assist
    experimenter in modeling chemical degradation kinetic data. The
    selection of the appropriate degradation model and parameter
    estimation is carried out automatically as far as possible and is
    driven by a rigorous statistical interpretation of the results.  The
    package integrates already available goodness-of-fit statistics for
    nonlinear models. In addition it allows data fitting with the
    nonlinear first-order multi-target (FOMT) model.