diff --git a/Workshop4/MolCal_draft_CCH_171124.pptx b/Workshop4/MolCal_draft_CCH_171124.pptx
new file mode 100644
index 0000000000000000000000000000000000000000..da506bd3b5a70be2e638c701a7f7d7e5a61af5fa
Binary files /dev/null and b/Workshop4/MolCal_draft_CCH_171124.pptx differ