Figure 2
From: Crystal structure and characterization of pyrroloquinoline quinone disodium trihydrate

Left: PQQ disodium trihydrate crystal observed under a microscope . Right: Molecular structure of PQQ disodium trihydrate (ORTEP).
From: Crystal structure and characterization of pyrroloquinoline quinone disodium trihydrate
Left: PQQ disodium trihydrate crystal observed under a microscope . Right: Molecular structure of PQQ disodium trihydrate (ORTEP).