Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_101336_1 (crystal_structure VARCHAR, formula VARCHAR)
### Question:
What is the crystal structure for the formula yba 2 cu 3 o 7?
### Answer:
SELECT crystal_structure FROM table_101336_1 WHERE formula = "YBa 2 Cu 3 O 7"