Comp. Source Ref. 3 Aplidium constellatum 81   Bathymodiolus septemdierum 82   Cynthia savignyi 83   Didemnum salary 87   Eunicella cavolini 88   Glyptocidaris crenularis 89   Helianthus tuberosus 27   Hyrtios erectus 89   Luffariella cf. variabilis 94   Oscarella 91   Trididemnum inarmatum 88   Tripneustes gratilla 92   Didemnum salary 87 4 Lactarius hatsudake 34   Meretrix lusoria 93   Luffariella cf. variabilis 94   Didemnum salary 87 5 Luffariella cf. variabilis 94   Meretrix lusoria 93   Didemnum salary 87  6 Luffariella cf. variabilis 94   Didemnum salary 87  7 Eunicella cavolini 88   Luffariella cf. variabilis 94   Trididemnum inarmatum 88

Table 2: Steroidal endoperoxides 3-7 and their natural sources.