diff --git a/Workshop4/MolCal_draft_2.pptx b/Workshop4/MolCal_draft_2.pptx
new file mode 100644
index 0000000000000000000000000000000000000000..99f634e0458404275835728bfb7768cfd79f3ff6
Binary files /dev/null and b/Workshop4/MolCal_draft_2.pptx differ