SEARCH Articles Figures Tables Psammaplysilla purea Psammaplysilla purealidins Psammaplysilla purpurea Psammaplysilla purpurea antimicrobial activity Psammaplysilla purpurea presammaplin A from Psammaplysilla purpurea psammaplin B from Psammaplysilla purpurea psammaplin C from Psammaplysilla purpurea psammaplin D from