Compounds

if (nbt.hasKey("compounds")) {
    int compoundNumber = 0;
    NBTTagCompound compoundTags = nbt.getCompoundTag("compounds");
    NBTTagCompound compoundTag;
    List<Compound> compoundList = new ArrayList<Compound>();
    while (!(compoundTag = compoundTags.getCompoundTag("compound" + compoundNumber)).hasNoTags())
        compoundList.add(Compound.from(compoundTag));
}