when was lawrence academy at groton established? 
CREATE TABLE table_2439728_1 (founded INTEGER, school VARCHAR)
SELECT MIN(founded) FROM table_2439728_1 WHERE school = "Lawrence Academy at Groton"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_2439728_1 (founded INTEGER, school VARCHAR) Question: when was lawrence academy at groton established?  [/INST] SELECT MIN(founded) FROM table_2439728_1 WHERE school = "Lawrence Academy at Groton" </s>