143605-57-6 1H-Naphtho(1,2-c)pyran-1-one, 3-ethyl-3,4,4a,6a,7,8,9,10,10a,10b-decahydro-5,10b-dimethyl-, (3alpha,4abeta,6abta,10abeta,10balpha)-(+)- PI 200 PI-200