... dihydroxy-ß-carotene-4,4'-dione;Trans-Astaxanthin; Haematococcus Powder Botanical Resource: Haematococcus pluvialis. CAS No.: 472-61-7Molecular formula ... trout, shrimp, crustaceans, and other sources. However, Haematococcus pluvialis appears to be the best source of astaxanthin. ... by a closed circulation system, which allows Haematococcus pluvialis to proliferate efficiently for the production of ...