Asymmetric Residue Units :: UNIQUE = 2, INTER = 0, TOTAL = 2 The first 1 refer(s) to 1555.nn ARU's, the next ones to _a, _b etc Resd# ARU AtomColor PatternColor BondColor #Lines 1 1555.01 - - - 0 2 3575.01 - - - 0 (Partially) ACTIVE Asymmetric Structure Units = 2 1555. 3575.