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_2068719_1 (δs_ VARCHAR, _butadiene VARCHAR)
### Question:
Name the number of δs ‡ /cal mol −1 k −1 for butadiene being 1,2-dimethylene-cyclohexane
### Answer:
SELECT COUNT(δs_) AS ‡__cal_mol_−1_k_−1 FROM table_2068719_1 WHERE _butadiene = "1,2-dimethylene-cyclohexane"