What is antigone supposed to do?

In the play "Antigone" by Sophocles, Antigone is expected to follow the laws and customs of her society and respect the authority of her uncle, Creon, who is the king of Thebes. Creon has forbidden the burial of Antigone's brother, Polynices, because he considers him a traitor to the city. However, Antigone believes that she has a moral obligation to bury her brother and defy Creon's order.