Which four principles does the united nations global compact for multinational corporations address?

Actually, it's 10 principles, but they're divided into 4 sections:

1. human rights: Support  internationally proclaimed human rights and   Make sure you are not complicit in human rights abuses.

2. Labour Standards:  the freedom of association; the elimination of all forms of forced and compulsory labour;  abolition of child labour;  the elimination of discrimination in employment and occupation.

3. Environment Protection: support a precautionary approach to environmental challenges;  promote environmental responsibility; encourage environmentally friendly technologies.

4.  work against corruption