import pandas as pd

df = pd.read_excel("pnas.1516376112.sd01.xlsx", sheet_name="ST1-genes-beautified")
df = df.rename(columns={"GR_PUBNOAUT_LGDs_post": "Iossifov Wigler PNAS 2015 post noaut"})
df.to_csv("Iossifov_Wigler_PNAS_2015_S1.csv", index=False)